Boeing could cancel the 737 MAX 10

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Originally Posted by DaveReidUK

I'm trying hard to figure how AA could place an order for a type/variant neither announced nor on the drawing board.

Yep, strange, though it happened, see:

Originally Posted by 2011, boeing.mediaroom.com

Commitment to order 100 737s with new engines and options for 60 more

Originally Posted by 2011, NYTimes

American, ..., said that it planned to acquire 260 of the Airbus A320 aircraft and 200 Boeing 737s — half of which will be equipped with a new, more fuel-efficient engine.
The move is a clear commitment by Boeing to revamp its best-selling 737 with new engines rather than develop an all-new version of the plane — a strategy that until now it had said most of its customers preferred.