Replacing the 737 family is probably the right course but can't happen now - too much invested in the MAX. But ensuring that the technology, systems, flight deck etc of the 797 could be...
But only one removal seems to have been gearbox related?
RR should have stayed in IAE to develop the GTF and, by contributing its fan and hot section experience, it would have been a much...
Wasn't the 757 flight deck profile changed to provide commonality with 767? Same imperative didn't apply to the 737.
Re-engine the A310-300 - job done!
Delta and VAA together on LHR - NYC / LAX and SFO could use six A380s: get a premium into slot constricted LHR and, for the time being, be the only A380 operator from LHR to NYC.