Flap steak is skirt steak and most carry lots of marinades and seasonings. PIcked up some marinated beef fajitas for this weekend
Flap steak is quite different from skirt (at least here on the east coast). Flap looks like thick skirt, but is MUCH more tender. From what I know it is part of the sirloin that is not mass marketed, because there is not much of it on the animal. I use flap steak a lot for kabobs (more than any other meat). It is very tender and takes a marinade very well. Five years ago I could get it very cheaply, but now it is more expensive than sirloin.