Peter47
Is it possible for an airline to "swap" flights in the hold?
Yes - have actually done that a couple of times. Holding at LHR, awaiting my turn for a Cat III autoland, I had a call from ops asking if I was going to divert. Told them I had plenty of fuel so they asked the favour to allow a company flight above me to go first due getting close to minimum. After ATC had picked him out of the hold I had another call from ops.....
That's how I learned to keep my trap shut.