I just installed 2.2.1.6 and manually updated AIRAC to 1706r4. I'm trying to plan a flight from 4U9 and got an error that I had to set the departure airport as the first waypoint of the flight plan. I tried making 4U9 the destination (from KDLN) and was told that it was unable to locate waypoint 4U9 in the database. I've tried some other three-character airports (6S1, 7S1) and have the same problem. A nearby tiny airport with a four-character code (MT05) works fine. However, I can pull up Taxi Maintenance and browse to 4U9 without any difficulty.

Disregard, looks like Navigraph has a K in front of my three letters, so K4U9 works. I'll try some others but I assume that's what the problem was.

In the US, the 3 Ltr ICAO codes are preceded by a K.

You should upgrade to AIRAC 1707 ASAP as 1706, which is in the old format, may cause CTDs in version 2216.

Dave

When exporting a flight plan to X Plane, if the destination US airport is a 3 Ltr code, I have been having to edit the .fms file to remove the leading "K". The X Plane GPS will not recognize it with the leading "K" added to the identifier.

Bruce

Unfortunately, I don't think I'll be able to fix this since it is in the data. 

I'll add it to the list of things to try and fix in the future.

Thanks,

Dave

Thanks Dave... Not that big of deal, easy to edit if I remember to :-)
Bruce