Just be forewarned that the quality of Quiznos varies widely. I'd had some fabulous sandwiches there and some dreadful ones. Ditto the service.
They seem to have less quality control over their franchises than Subway does.
And absolutely avoid the one in the USAir terminal of the Detroit airport. Yechh! It's funny you mention that - the Quiznos I went to yesterday was immaculate and the 2 guys working there seemed to take great pride in what they were doing. I guess I found a good one. ;)
I avoid flying through Detroit - EVERY time I've flown through Detroit I've had some kind of significant delay.
Kevin