Going through security at IAH C if flying DL
 

Would I face any issues if I'm flying DL, but go through security at IAH terminal C? I'm flying back on UA, so I would prefer to park in the C garage.

Thanks!

You may access any checkpoint at your departure airport with the appropriate same day document, e.g. BP.

It is possible that a line minder or Officer may point out that you are at the "wrong" checkpoint, but that is a courtesy and no a refusal. If by some odd chance, you are denied entry, ask for the TSA supervisor on duty.