CT you are really getting frustrated by this stream. (I wonder why?)

IMHO its based on the fact you don't know how to go into negative balances. Your first question was HOW

I smell moral indignation tied to jealousy

It is no less immoral to run with a negative balance that to be saving for years for a free ticket only to have its "cost" increase by over 2 times. I don't care if some routes only went up 15%. The route I travel went up over 200%