You're only considered contagious for 24 hours. My DD17 was sick this week, saw the doctor Tuesday, went on antibiotics (ear infection), and was told she could go back to work Wed. I kept her home, just because I wanted her to rest an extra day. She works with children, so if she were contagious, believe me, nobody would want her there!
As to the trip, just make extra-sure everyone is comfortable for the flight. Tylenol, decongestants, etc. My poor DD, we flew down to Baltimore (college visit) last weekend, right before she was diagnosed. She was quite uncomfortable on the flight.
I would also try to take things easy on that first day, especially if you guys are up at the crack of dawn to catch your flight. Save the late-night fireworks and EMH for later in the week, when everyone will hopefully be 100%.