I think the Pension Trustees are required to act in the best interests of all members of the Pension, aware that some members were getting a better deal in NAPs 1 and 2(ie. flying staff), then to allow changes that that give some members an 18.75% Pensionable Pay Rise(ie. flying staff) appears most UnFair.
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Ground staff would have done better if the Regulator was used to sort out this mess.
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I would guess when all the ground staff understand how UnFair they have been treated in these pension changes we will see various Legal Actions starting, it could be a slow painful show???