His roommate dropped him off without realizing a thing, though. It's much easier to avoid suspicion when you can get dropped off relatively close to the checkpoint and walk over then it is to walk through the whole airport with people looking out for suspicious bags.
There's some confusion I think bc those not familiar with large airports, or air travel, might not understand that TSA & the scanners aren't where check-in is. When a person walks into an airport (at least every airport I've ever been in), they check-in right away...I usually do online check-in myself bc of the lines. Then the air traveler walks to the scanning area for their terminal, which is where TSA is. They take your documents, including your ticket, to make sure you are who you are, then give them back to you. You take your shoes off (I usually wear flip flops bc it's easier), put your bags & anything metal in containers, put them on the conveyer belt to be scanned, then you walk yourself into the full body scanner. Once you step out, you gather your belongings & proceed to your terminal.
IMO, airports are damned if they do & damed if they don't - where are they supposed to put the scanners? I agree they should be closer to the entrance, but if they're too close then the crowds will be outside on the road...which is another hazard. Plus, if its winter in a cold climate, or raining, etc. Maybe make a secure room before the patrons are able to enter the main areas of the airport? Idk.
Bottom line, IMVHO, is that if somebody wants to commit mass murder - they'll find a way no matter what.
Airports can beef up security & TSA can start arming theirselves - which I believe they should anyway - but even if the govt makes drastic changes, it'll never take away from the crowds of people waiting in these lines. Every single airport I've ever been in never has less than 100 people in line waiting to be scanned.