Cash to sit out a three month strike? Don't make me laugh! Remember while they are sitting there earning no money for three months they are refunding a huge amount of that cash pile back to the customers they haven't flown and compensating them. They are getting no new money in as forward bookings disappear. They are paying the leasing companies and the fuel companies. They are paying airports to park their aircraft. They are paying wages to all the other staff who aren't on strike. The shares will have been delisted. The institutional shareholders will be watching the value of their holdings collapse and will be breathing down the boards neck, and all the while BA are failing to use their LHR slots leading to them losing a significant proportion of these strategically important assets . Not only do BA not have the money to sit out a three month strike, I doubt they even have the balls to wait out a two week strike.
You seem to place a lot of faith in the ability of the APS trustees to influence the outcome of this situation. I'm sure they do, as you say, have a say. However this is going to be a back-breaking strike for BAs management and their options will be to come to the table and offer something decent or see the company go under. You may find the APS trustees having to take whats available in preference to nothing at all. You are not immune.