This.
However, I flew to San Francisco the day after one of the bombings in the 2000s (forget which, might have been the shoe bomber event). First the flight was moved from LHR to LGW, I noticed from home and went directly to Gatwick, pity the other passengers who got bussed. The flight eventually boarded hours later and we were not allowed to take anything onto the plane except our boarding pass and any keys without remotes. Everyone's laptop bag and electronics were in the hold. Of course that was the fastest boarding flight I've ever been on - walk on, find seat number, sit down.