At night I noticed that all my AI traffic don't have taxi lights. When they taxi around the airport their lights aren't on. It's not untile just before takeoff and landing that I see lights in front of the aircraft... I'm using Ultimate traffic but I don't think that would cause this problem.

I think it is model (*.mdl) related. If the taxilight is defined properly in the model, it will shine during the appropiate hours. I use Project AI models and noticed two 757-200 aircraft taxiing, one behind the other. The first had a nose wheel strut taxi light shining but the other had nothing.I put the default trafficxxx.bgl back into fs2004 temporarily. I selected night at a busy airport. At least the default B737-400 had a taxi light during taxi.W. Sieffert