I have seen a few youtube videos of large airliners taking off without flaps, the A300-600 and USAIRWAYS 767-200ER in particular. Is this a common practice? Are the slats set at least or are they taking off clean like a general aviation aircraft would?
I could imagine being very troubled if I were a passenger on one of these flight, was sitting on the wing, and noticed us being on the runway ready for takeoff with the flaps still retracted.