Hi All,

Thanks to the combination of vacation and a record amount of rainfall in the 
last four days, I've been able to rework a major section of the AI traffic 
code. One of the weakest aspects of the AI traffic system was that aircraft 
never performed a reasonable approach, but basically just plummeted out of the 
skies, only to pretend making a reasonable landing (and usually ending up 
several miles short of the runway).

The new code generates a more realistic approach path, and ensures that 
arrivals will start almost instantly after program start. The approach paths 
are set up in such a way that aircraft will be lined up with 90 seconds of 
flight time (or more) between them. This is done by using small changes in 
length of the final approach path, combined with an approach controller / 
pilot that commands small changes in descent speed, to ensure that each 
aircraft will arrive at the final approach fix at the slotted time. 

Note that there are still a few issues remaining, but I'm planning to fix 
those later (most notably, there's still a rather sharp drop onto the runway 
at the end of the landing phase, but I'll work on that later. 

I'm planning to push this onto gitorious towards late afternoon / early 
evening today. I'd like to let it run for a few more hours, and still need to 
remove a couple of dozens of debug messages, but other than that, I think that 
the code is ready for more general testing. 

Please let me know if you find any issues (once committed). I'm currently 
having vacation, so I should be able to address any issues withing reasonable 
time.

Cheers,
Durk

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