I tried this a couple of nights ago, and it worked great...

A while back someone posted a question about listening to music while flying. There was some suggestions about MP3 files, and listening to the CD, and that, but I started my favorite Internet Radio station, (www.sirius.com), then started FS, and took a 1,200 mile trip. On my machine, anyway, I was able to hear the music, and the aircraft sounds and the ATC instructions without any trouble. It didn't lower my frame rates, either.
Rockin' out in the seat at 30,000 ft. is quite cool.

Maybe this tip can help you guys pass the time on those long flights.

Later,
Al