What is a good substitute for flap meat?

Online Answer
If you can't find skirt steak you can substitute flap steak (flap meat), or thinly sliced beef tenderloin or short loin steaks. You can alternately use flank steak as well..
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Also called flap steak, the unflatteringly named cut is similar to skirt and flank in that it comes from the less tender regions of the animal. Often cheaper than more popular cuts, this little underdog of the beef world has a wonderful meaty flavor and fine texture when prepared carefully.
Optimally, for tough steaks like skirt and flank, it's best to marinate it no longer than 24 hours in the refrigerator. Beyond overnight marinating is overkill. Also, never re-use a marinade.
Skirt steak is cheaper per pound than flank steak. Both are relatively cheap cuts and a good deal most of the time, but if you're really pinching pennies then you can get more meat with your dollar going with skirt.
Skirt steak is a cut of beef steak from the plate. It is long, flat, and prized for its flavor rather than tenderness....Skirt steak.Beef cutsAlternative namesRomanian tenderloin.
The flat iron is very similar to any of the flat steaks, so any recipe calling for skirt or flank steak will be the perfect opportunity to try the flat iron steak. This cut is best grilled over medium-high heat.