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A tiny fraction of the Max variants await their future........
...

I would anticipate that the full and final payment would be upon delivery?
The ‘late delivery’ penalties to Boeing will surely be incredible!

I believe that they are all sold (subject to future fixes!)
There are some interesting photos online, of hundreds lined up on a couple of Washington (State) airfields.

I strongly suspect that if the aircraft were manufactured by Airbus, then the FAA would have grounded them.
Fingers crossed that one doesn’t have an incident Stateside.