How did you place this in the ai traffic file.
You might want to check out a program called simple ai
it gives you the layout of the entry needed for ai traffic,
If you look at the entry for this flight you should be able to spot your problem. You have to tell it what time to start the flight where it has to go to and what the repeat rate is.But in the real world most airlines have a 35 to 45 min turn time.Except for southwest which only has 10 min. Which is alomst impossable to make, esp if you have to put on alot of fuel.Internationl flights have anywhere from 1 hour to 3 hours between flights.