HELP!! Flying with a 2 month old..

Amber
At this end of this week my husband and I are taking a 3 hour flIght to visit his family. Advice on keeping sane and how to travel with a 2 month old? She is typically pretty good and may sleep the whole way. But if she gets in a mood- it could be awful!!! Also, our flight out is at 5:30 Am- that's what happens when you leave the booking up to the hubby!