Are they actually taking a bus to Stillwater??? Why aren't they flying to OKC and busing in from there tomorrow??? All part of scary smart, I guess.
Surely, you're not serious...
It's just a little over 5 hours to Stillwater from Manhattan if you don't break it up with the walkthrough in Wichita. By the time you'd bus the kids to the airport in Manhattan, fly them to OKC, get them off the plane and on a bus to Stillwater (a 1.5 hour drive from OKC), you'd barely save any time.
All this doesn't even take into consideration the fact that you take away valuable meeting, and study, time that occurs on a travelling bus.