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I don't know if anyone might find this useful, but here is how I got TopCat + PFPX to match the weights used by the various PMDG 737NGX FMC's. This was all calculated and recorded by loading 737 variants (both mixed-class and single class seating [they are different]) and zeroing-out the fuel and payload and then recording the basic FMC dry weight (DOW). I then loaded full passengers (no fuel) to record the ZFW for each class, then added full fuel (46057 all cases) and noted the MTOW. PLEASE NOTE: In order for TopCat, PFPX, and the 737NGX FMC to match exactly, USE ONLY ADULTS, with weights preset to 175 lbs per adult, in the TopCat and PFPX preferences. Don't use children or infants in your plans. 175 lbs is what the 737 FMC uses when populating the 'seats filled' in the FMC. So when the PFPX OFP tells you C8 Y128, you load 8 first-class and 128 in Y class (coach), and match the cargo distribution from TopCat - your FMC weights will be a perfect, spot-on match. The biggest headache using TopCat and PFPX (prior to launching FS) is determining if the desired 737NGX variant is a single-class or mixed-class configuration. I personally like realistic livery.ini configs and keep them as originally created. To determine the respective livery.ini file before firing up FS, I use a free program (from the AVSIM library, I think) called AIRCRAFTER. I load it up and drill down to my desired PMDG 737 variant I wish to use for the flight. I then have AIRCRAFTER open the texture folder for the chosen livery and I inspect the livery.ini file. Near the bottom of the livery.ini file, there is a line similar to 'singleconfiguration=1', which defines a single-class variant, or if set to zero, indicates a mixed-class variant. This is irrespective of the fact that you could simply change the class (single or mixed) once you load up the livery in a FS session, and change it in the FMC Aircraft options to match your PFPX and TopCat weight calculations (number of seats). The following TopCat configurations were noted directly from the PMDG 737NGX FMC, which will be used as templates when creating each PMDG 737NGX aircraft variant in TopCat and PFPX. These TopCat config files should be located in your TopCat install-path ..\TopCat\Configurations. Create the file-name (bold) and copy the content into each file. Boeing 737-600 PMDG Mixed Class.txt [GENERAL] Aircraft=PMDG B736 Mixed Class Units=LB [CONFIGURATION] Config=C8 Y111 Pax=119 Cargo=11200 Fuel=46057 DOW=80200 MZFW=112200 MTOW=144000 MLW=128928 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-700_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=113.000 wing_sweep=25 wing_pos_apex_lon=-34.000 empty_weight_CG_position=-48.170 MAC_Shift=0.10 [MAC_LIMITS_ZFW] mac.0=75000;18.0;26 mac.1=80000;17.8;27.0 mac.2=104000;15.7;31.7 mac.3=121700;14.1;33.2 [MAC_LIMITS_TOW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [MAC_LIMITS_LDW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [PASSENGER_STATIONS] station.0=8;-48.350;First;1 station.1=120;-48.350;Coach;2 [CARGO_STATIONS] station.0=12200;-48.350;Fwd Cargo;3 station.1=15000;-48.350;Aft Cargo;4 [FUEL] tank.0=-51.380;4 tank.1=-44.780;1 tank.2=-51.380;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-600 PMDG Single Class.txt [GENERAL] Aircraft=PMDG B736 Single Class Units=LB [CONFIGURATION] Config=Y129 Pax=129 Cargo=11200 Fuel=46057 DOW=80200 MZFW=114000 MTOW=144000 MLW=128928 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-700_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=113.000 wing_sweep=25 wing_pos_apex_lon=-34.000 empty_weight_CG_position=-48.170 MAC_Shift=0.10 [MAC_LIMITS_ZFW] mac.0=75000;18.0;26 mac.1=80000;17.8;27.0 mac.2=104000;15.7;31.7 mac.3=121700;14.1;33.2 [MAC_LIMITS_TOW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [MAC_LIMITS_LDW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [PASSENGER_STATIONS] station.0=148;-48.350;Coach;2 [CARGO_STATIONS] station.0=12200;-48.350;Fwd Cargo;3 station.1=15000;-48.350;Aft Cargo;4 [FIXED_STATIONS] station.0=0;-48.350;Placeholder;1 [FUEL] tank.0=-51.380;4 tank.1=-44.780;1 tank.2=-51.380;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-700 PMDG Mixed Class.txt [GENERAL] Aircraft=PMDG B737 Mixed Class Units=LB [CONFIGURATION] Config=C8 Y128 Pax=136 Cargo=11900 Fuel=46057 DOW=83000 MZFW=118700 MTOW=153500 MLW=128928 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-700_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=113.000 wing_sweep=25 wing_pos_apex_lon=-34.000 empty_weight_CG_position=-48.170 MAC_Shift=0.10 [MAC_LIMITS_ZFW] mac.0=75000;18.0;26 mac.1=80000;17.8;27.0 mac.2=104000;15.7;31.7 mac.3=121700;14.1;33.2 [MAC_LIMITS_TOW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [MAC_LIMITS_LDW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [PASSENGER_STATIONS] station.0=8;-48.350;First;1 station.1=120;-48.350;Coach;2 [CARGO_STATIONS] station.0=12200;-48.350;Fwd Cargo;3 station.1=15000;-48.350;Aft Cargo;4 [FUEL] tank.0=-51.380;4 tank.1=-44.780;1 tank.2=-51.380;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-700 PMDG Single Class.txt [GENERAL] Aircraft=PMDG B737 Single Class Units=LB [CONFIGURATION] Config=Y146 Pax=146 Cargo=11900 Fuel=46057 DOW=83000 MZFW=120500 MTOW=153500 MLW=128928 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-700_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=113.000 wing_sweep=25 wing_pos_apex_lon=-34.000 empty_weight_CG_position=-48.170 MAC_Shift=0.10 [MAC_LIMITS_ZFW] mac.0=75000;18.0;26 mac.1=80000;17.8;27.0 mac.2=104000;15.7;31.7 mac.3=121700;14.1;33.2 [MAC_LIMITS_TOW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [MAC_LIMITS_LDW] mac.0=75000;18.0;27.7 mac.1=80000;17.8;28.7 mac.2=104000;15.7;33.4 mac.3=140000;12.5;36.4 mac.4=140500;12.4;36.25 mac.5=153500;15;33.3 mac.6=155000;19.7;28.5 [PASSENGER_STATIONS] station.0=148;-48.350;Coach;2 [CARGO_STATIONS] station.0=12200;-48.350;Fwd Cargo;3 station.1=15000;-48.350;Aft Cargo;4 [FIXED_STATIONS] station.0=0;-48.350;Placeholder;1 [FUEL] tank.0=-51.380;4 tank.1=-44.780;1 tank.2=-51.380;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-800 PMDG Mixed Class.txt [GENERAL] Aircraft=PMDG B738 Mixed Class Units=LB [CONFIGURATION] Config=C12 Y150 Pax=162 Cargo=16400 Fuel=46057 DOW=91300 MZFW=136100 MTOW=174700 MLW=146300 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-800_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=112.58 wing_sweep=25 wing_pos_apex_lon=-43.800 empty_weight_CG_position = -57.77 MAC_Shift=0.09 [MAC_LIMITS_ZFW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [MAC_LIMITS_TOW] mac.0=79823;10;27.2 mac.1=134409;7.99;30.5 mac.2=138298;8.96;30.72 mac.3=144500;9.61;30.9 mac.4=161068;12.8;32.77 mac.5=172670;14.8;30.08 mac.6=174198;16.95;25.10 [MAC_LIMITS_LDW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [PASSENGER_STATIONS] station.0=12;-57.450;First;1 station.1=148;-57.450;Coach;2 [CARGO_STATIONS] station.0=20794;-57.450;Fwd Cargo;3 station.1=22625;-57.450;Aft Cargo;4 [FUEL] tank.0=-62.120;4 tank.1=-54.670;1 tank.2=-62.120;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-800 PMDG Single Class.txt [GENERAL] Aircraft=PMDG B738 Single Class Units=LB [CONFIGURATION] Config=Y174 Pax=174 Cargo=16400 Fuel=46057 DOW=91300 MZFW=138200 MTOW=174700 MLW=146300 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-800_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=112.58 wing_sweep=25 wing_pos_apex_lon=-43.800 empty_weight_CG_position = -57.77 MAC_Shift=0.09 [MAC_LIMITS_ZFW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [MAC_LIMITS_TOW] mac.0=79823;10;27.2 mac.1=134409;7.99;30.5 mac.2=138298;8.96;30.72 mac.3=144500;9.61;30.9 mac.4=161068;12.8;32.77 mac.5=172670;14.8;30.08 mac.6=174198;16.95;25.10 [MAC_LIMITS_LDW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [PASSENGER_STATIONS] station.0=174;-57.450;Coach;2 [CARGO_STATIONS] station.0=20794;-57.450;Fwd Cargo;3 station.1=22625;-57.450;Aft Cargo;4 [FIXED_STATIONS] station.0=0;-57.450;Placeholder;1 [FUEL] tank.0=-62.120;4 tank.1=-54.670;1 tank.2=-62.120;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-900 PMDG Mixed Class.txt [GENERAL] Aircraft=PMDG B739 Mixed Class Units=LB [CONFIGURATION] Config=C12 Y162 Pax=174 Cargo=11100 Fuel=46057 DOW=94600 MZFW=136100 MTOW=174700 MLW=146300 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-800_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=112.58 wing_sweep=25 wing_pos_apex_lon=-43.800 empty_weight_CG_position = -57.77 MAC_Shift=0.09 [MAC_LIMITS_ZFW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [MAC_LIMITS_TOW] mac.0=79823;10;27.2 mac.1=134409;7.99;30.5 mac.2=138298;8.96;30.72 mac.3=144500;9.61;30.9 mac.4=161068;12.8;32.77 mac.5=172670;14.8;30.08 mac.6=174198;16.95;25.10 [MAC_LIMITS_LDW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [PASSENGER_STATIONS] station.0=12;-57.450;First;1 station.1=148;-57.450;Coach;2 [CARGO_STATIONS] station.0=20794;-57.450;Fwd Cargo;3 station.1=22625;-57.450;Aft Cargo;4 [FUEL] tank.0=-62.120;4 tank.1=-54.670;1 tank.2=-62.120;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Boeing 737-900 PMDG Single Class.txt [GENERAL] Aircraft=PMDG B739 Single Class Units=LB [CONFIGURATION] Config=Y186 Pax=186 Cargo=11100 Fuel=46057 DOW=94600 MZFW=138200 MTOW=174700 MLW=146300 Assumed=Y Derate=Y Combine=Y [AIRCRAFT] aircraft.0=B737-800_GE [TRIM] wing_root_chord=18.900 wing_area=1348.000 wing_span=112.58 wing_sweep=25 wing_pos_apex_lon=-43.800 empty_weight_CG_position = -57.77 MAC_Shift=0.09 [MAC_LIMITS_ZFW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [MAC_LIMITS_TOW] mac.0=79823;10;27.2 mac.1=134409;7.99;30.5 mac.2=138298;8.96;30.72 mac.3=144500;9.61;30.9 mac.4=161068;12.8;32.77 mac.5=172670;14.8;30.08 mac.6=174198;16.95;25.10 [MAC_LIMITS_LDW] mac.0=79823;10;25.9 mac.1=86822;9.85;27.65 mac.2=134409;7.99;30.5 mac.3=138298;8.96;30.72 mac.4=144500;9.61;30.9 mac.5=146299;19.15;31 [PASSENGER_STATIONS] station.0=174;-57.450;Coach;2 [CARGO_STATIONS] station.0=20794;-57.450;Fwd Cargo;3 station.1=22625;-57.450;Aft Cargo;4 [FIXED_STATIONS] station.0=0;-57.450;Placeholder;1 [FUEL] tank.0=-62.120;4 tank.1=-54.670;1 tank.2=-62.120;7 ;1 Centre Tank ;2 Centre Tank 2 ;3 Centre Tank 3 ;4 Left Main Tank ;5 Left Aux Tank ;6 Left Tip Tank ;7 Right Main Tank ;8 Right Aux Tank ;9 Right Tip Tank ;10 External Tank 1 ;11 External Tank 2 Now, create your aircraft in TopCat similar to below. Please note, the aircraft registration text is important in that it must be identical to aircraft registration numbers created in PFPX. It is these reg #'s that tie the two programs together when sending OFP data from PFPX to TopCat, as well as adding Max Takeoff and Landing Data to the OFP when initially creating the flight plan in PFPX. I chose to name my TopCat PMDG 737 aircraft after the models and add a -M for Mixed load configs and add a -S for Single load configs. An example of my PMDG 737-S details can be seen; NOW, for some configuration fun in PFPX... Please note, as of this article, PFPX v1.04 Update was just released with a lbs rounding error fix which directly relates to the topic of this article. Now open up your PFPX preferences page and set the Adult weights to 175 lbs and the baggage weights to the same value used in TopCat - the specific baggage values are not important, as long as they are the same in both TopCat and PFPX. Now open the Aircraft database in PFPX and create the same list of PMDG 737NGX aircraft, just as you did in TopCat, keeping the aircraft registration numbers exactly the same as those created in TopCat. You can use the Aircraft Template feature when creating the PMDG aircraft, juts make sure you change the engine variants for each, before saving. When creating each PFPX PMDG aircraft, make sure you populate the weights and numbers exactly as you did in TopCat, which again, were originally derived from the actual PMDG FMC. As you can see, now we can use the PMDG 737-S (single class) with all the basic weights pre-populated, to work with both TopCat, and the PMDG FMC for the specific model. Remember, use only the adult weights and confirm your final ZFW in both TopCat and the PMDG FMC - they should be exactly the same. At the top, you can use the 'Takeoff' and 'Landing' buttons to calculate the MAX aircraft performance data, which will only be display the performance results OFP. This has nothing to do with getting the OFP data into TopCat - next step. Next we will use the calculated PFPX flight to completely pre-populate the TOPCAT GUI for final performance calculations. Remember, both PFPX and the full version of TopCat must reside on the computer. Press the 'Send To' button at the top of the Screen to begin the process of exporting the entire OFP directly TopCat. As you can see, we now have a completed TopCat form prepopulated, ready for use with the PMDG FMC. Hope this helps a few folks.