Flight plan compilation

I am not sure about timetables and years etc. But I do know that it is possible for FSX to load more than one traffic AI file (.bgl file).

For example, I have ORBX's New Zealand South Island and North Island scenery. That scenery contains additional airports that the default FSX does not have. My normal traffic AI .bgl file caters for the default FSX airports, worldwide. All good. But, I also have an additional (second) traffic AI file that caters just only for the additional airports that are in ORBX's New Zealand South Island and North Island scenery. Both of these files happily load in to FSX and I see traffic at all the FSX default airports, as well as all the additional New Zealand ones. If I ever uninstall the ORBX New Zealand scenery, I will be able to also simply remove the additional (second) New Zealand traffic AI .bgl file.

If you are creating or working with more than one traffic AI .bgl file, be careful that no planes are "doubled-up" (ie, the same plane and flight plan appears in TWO of the compiled .bgl files) ... Otherwise you will see duplicated planes in your skies.

And, finally, a word of warning ... I have read that FSX can get upset if you have TOO MANY traffic AI .bgl files. Having said that, I don't have conclusive proof that this is true, nor have I ever experimented or tested this. I only have my TWO traffic AI .bgl files, and I'm happy with those.

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Edit:

Oh, and as further support to the fact that FSX can work with and load more than one traffic AI .bgl file, don't forget there's also other files such as "trafficBoats.bgl" (loads AI ships), and other similar .bgl files already installed (usually) in to your "C:\...\Flight Simulator X\Scenery\World\Scenery" folder all ready to go for you when you run FSX.

As always I need to say that I am only (?) a TrafficX user but I suspect what I am going to say goes for Traffic 360 also.

Due to the way that TrafficX/360 compiles schedules, i.e. putting random percentage values into the BGL so that appearance of aircraft will vary depending upon your FSX traffic settings, I use AIFPC to create additional BGLs for traffic that I want ALWAYS to appear at the required airports. To this end I have over 12 extra BGLs of mine in the same location as the main ones.
It may also be of interest that I have sets of UK2000 airfields installed and each airfield is supplied with its own small BGL to make sure that there is some activity at all of the airfields. This means that there are loads of BGLs (over 100) being read by FSX and, in my case anyway, there seems to be no degradation in performance.

Incidentally, I used to think that the 'random percentage values' were a nuisance in that you would 'schedule' a flight in TrafficX, compile and open FSX to look for the aircraft only for it not to appear as it had a value above my FSX traffic settings value. As I said earlier, I overcome this by using AIFPC when required. But at least this 'randomness' can be good as, if you do a TrafficX recompile without even having made any schedule changes, you will get different traffic at your airports/airfields due to the random effect being different.

Thanks guys for your help. Glad to know I was not doing anything wrong !