Congratulations! I will also be visiting Glacier this year with my 4 kids... We will however, be driving, cross country (starting in the SE)
This will be my 2nd year taking the kids on an "Out West" road trip. Last years highlights included Grand Canyon, White Sands, Amarillo, Vegas, Zion, Colorado, St Louis, Mempis, Nashville (not in that order!) We (I) drove 5500 miles total and we were gone for 18 days. It was awesome!!
Looking forward to seeing Glacier, Mt Rushmore, Bad Lands, Yellowstone, Seattle to name a few.. I am a late planner (by MMM standards) so it will come together as it gets closer.