Is there any way that I can add Allegiant Air to the aircraft list? I have looked thru it and cant find it.

Not in V4, it is in V5.http://en.wikipedia.org/wiki/Allegiant_AirTo add it to several controller and pilot voice files would require recording an .wav file for each folder with the word "allegiant" and then modifying some data files or at least c4.csv. The problem is that when the pilot or controller phrases are combined for playing that one word will be in the voice you recorded it in.Unfortunately at this time only test synthetic voices have been used to generate .wav files for rc5 betas and they will not match those of rc4 which uses real voices. The .wav audio file would not match rc4. It still is quite a bit of work. There are 44 folders of recorded voices - you can see these in the voices tab of RC - and the while the pilots and copilots have some audio duplication the controllers would be radioized - no duplication.If you have build 3485 of RC you have the latest .wav filesrcv43.pdf, the manual in the rc4 folder, page 131, described the prerecorded chatter file structure and how to add wavs to that. It would not help with ai chatter and pilot, copilot, and controller .wavs.