I'm pretty confident showing up at most domestic air carriers with that Tardis ground effects bag Nun uses, holding a bike frame, wheels, and even a not-quite-ultralite bike touring assemblage.....

and you're going to get tagged for oversized luggage. There's no two ways around it. its an oversized bag. you'll have to pick a carrier with generous baggage policies.

i know guys who play bike polo and fly with SNS-equipped bikes in soft bags, and they get tagged when the bag is even fractionally over the 26" x 26" x 10" linear dimension airline standard cuttoff for oversize luggage.