Only one airline has a fleet of more than two dozen 737 MAXs (of any variety) currently: Southwest (and that's only 5% of their fleet). There are essentially no

Only one airline has a fleet of more than two dozen 737 MAXs (of any variety) currently: Southwest (and that's only 5% of their fleet). There are essentially no airlines with large fleets of them yet, which makes this relatively easy for them to deal with. That said, "relatively easy" is still a comparative: aircraft are frequently leased and having any out of service will be costing the airline a lot of money.