I have recently begun installing AI traffic using Most realistic AI, and Project AI Flights.After adding the US portion my problems began. With about 5,000 flight plans, FS would run for a few seconds then crash.I restarted, and added only about 2,500 plans and things ran well. Slowly, I added flight plans until I crashed again at about 4,000Whats up?I am running at AMD 2600 with 512 mb of RamFS9My creation has 193 aircraft, 5536 airports, 4,899 flight plans with 175,360 legs.Could it be not enough memory? I never had this problem with FS2002 running with 384 mb of ram.Brian

I don't believe that it is the number of flightplans that you have. I'm running with 512MB and I have more flightplans that you do (I think). I do not know if a corrupted flightplan could cause this problem but that's what I'd be looking for. R-

It isn't the number of flightplans, I have over 35,000 flightplans and over 1,000 repaints (albeit with AI set to only about 46%) on a fairly old system and although my framerates are not always brilliant, my system doesn't crash!You don't say precisely what FS had reached when crashing. Are you already in your aircraft or is FS still loading up?I notice you have been mixing flight plans from different sources.How did you compile them?Did you use TTools or auto-installers?TTools checks as it compiles so if you did it that way, I doubt you could have a corrupt flightplan.If you have a flightplan which can't find the relevant aircraft, that isn't a problem, as far as I know, the flight just doesn't appear.If your problem is traffic related, my guess is that having mixed sources,and may have used autoinstallers you might have 2 aircraft using the same aircraft reference number.Each of the main providers of AI flightplans have there own numbering conventions, and the two you have used might overlap.I have never run into that problem, but I can see it could cause some confusion.TTools (search library for Lee Swordy as author) can break your taffic files down into their 3 components represented by 3 text files: aircraft.txt, airports.txt and flightplans.txt.I'd check over aircraft.txt and look for duplicate AC# numbers.If you then recompile, TTools will tell you if you have missing airports in airports.txt or a corrupt flightplan.I'd also search the forums for crashes due to defective scenery. Have you loaded any non-standard scenery? Your problem sounds like something I'm sure I've read in that connection.