The cancellations haven't officially taken place, but you can be damn sure everyone other than committed 737 fleets like Southwest have unofficially already cancelled their orders of MAX's. Air Canada is the perfect example, it's the first time to introduce 737's to their fleet - they are waiting for the dust to settle but you can be damn sure the 737's they already own will be sold and Boeing will largely give them their money back too and the rest of their order will never be completed.