FSX AI problems.... Apologies if this has been done to death but despite reading the relevant parts of the manual,I'm confused with AI speeds, 37min. rule and compile/decompile in AIFP I'm using FSX, Windows 7 64bit and AIFP to create AI flightplans. When I compile flightplans using AIFP and using a mix of default FSX airliners (and add-on a/c which seem to work ok as AI planes, albeit not showing up for landing) my AI flights take off from the designated airport at the correct time but do not turn up to land after the return leg, at the designated times according to the AIFP-generated flt.plan. However, after the arrival time has passed, with no sign of the AI aircraft, if I then reset the Sim time to a point just after the scheduled arrival time, then my over-due airplanes are neatly parked on their correct stands and they start-up and take off normally for their next leg. There are ample parking spaces for 'heavy' and medium sized jets. I have read about the 37 min. problem and tried editing my flt.plans to have longer flight-times as compensation for late arrivals without luck. I used guesswork adding various times from 30mins. to two hours, to the flight-times. I then reverted to the AIFP-generated plans without using the 'override ETA' function. Does AIFP always calculate the correct flight-times for 'long-haul' flights? The only flights which turn up on time and land normally are domestic ones with a flight-time of around 30 mins. or so, but the problem shows up when I try to use flights of an hour or longer, eg. transAtlantic flights. My airport (Shannon) is an add-on but parking spaces, taxiways etc. seem to be in order, so I don't think it's a parking-space related problem. I also have de-activated the "Aircraft casts shadows on the ground" option to no avail. The aircraft have their default cruising speeds specified in the air.cfg files. I have removed the default traffic.bgl file from FSX and just use the default a/c to make my own fltplans. My specimen flight plan is as follows: EINN - KJFK - EINN. Default Boeing 747-400. Distance = 2669 miles (both legs) Duration = 6:08 (both legs) AC#1,,1%,24Hr,IFR (1) 03:30,09:38,350,F,0747,EINN (2) 10:00,18:00,350,F,0748,KJFK I'm suspecting there's something wrong with my flightplans' duration times, but I have no idea which way to proceed from here. Any help/advice appreciated!