Do the built in locks satisfy the TSA requirements? Are they able to open and re-lock the built in locks to inspect when the case is being screened?
Only if they have the key. When I shipped my firearms to AK this summer, I followed the airlines instructions about putting them in my luggage. The went there and came back without an issue. I used a nylon fastener to secure my luggage. The case is fiberglass and may be x-rayed, why would the TSA need access, thereby leaving you liable to theft by airline employees etc.? You need to further study the regulations.
I purchased this stroller for my daughter. She loves it, she says it is the most compact stroller on the market. Yes, all strollers can go to the gate and be checked at the gate. The biggest issue is getting it through security, she says she has seen them go through security many times.