2 things which really tanked our encounter using this type of trip with Asiana Airline (which was once amongst my favorite airlines): one) The "random" security screening in the boarding gate is crazily thorough (which is totally redundant to the safety screening ahead of we went via the security checkpoint https://flightstobangkokuk.blogspot.com/2023/01/why-do-flights-overbook-and-what-should.html