Certainly not, that would destroy profit and competitiveness. Spare airplanes are mostly in for non-essential maintenance, and spare crews can be called up in a

Certainly not, that would destroy profit and competitiveness. Spare airplanes are mostly in for non-essential maintenance, and spare crews can be called up in an hour or two. That's good enough. Catastrophic outages every few years still cost less than building decent redundancy into all operations. This is partly because airlines are still externalizing a good portion of the cost onto their customers, who need to rebook at short-term pricing. I'd love to see legislation to address this loophole.