Yes quite likely the medical procedure is safe. Most plane journeys are safe but if your hijacker/pilot has been feeding his mind on clap trap you could end up in a twin tower.
Good to check out the pilot, airport security - the plane (as you get on), ideally all the passengers etc etc. When it's your life, you are daft to be reassured by others saying 'oh it'll be fine'. Do your own due diligence to the extent you can.
Let's face it we've all be had by Watchtower. An outstanding bunch of wolves, fully up to speed on disguise and capable of deploying cutting-edge thumb screws.