Just flew with Delta yesterday and there was a guy at the gate force-checking everyone's bags. But remember, you cannot allow them to check a bag full of lithium ion NPs. I just politely said 'I'll hang onto this one, thanks' and there was no argument. Easy breezy. Also, if you haven't done it yet, I highly encourage TSA Pre. 2 minutes through security. No gear tear downs, no belt removal, just breeze through.