i ran the numbers FR against BA
..and it came out that i would be better off going to BA and NEVER getting a command rather than staying at FR with the current rate of decline of T&Cs (losing approx 2-3% per year to inflation). This would be with minimum 20 years left to fly from the changeover. Any longer, the BA option just gets better...
When you look at the differences, don't forget to include the BA perks (ID tickets, decent pension, licence costs paid, food, uniform etc etc etc) as it all adds up, particularly if you like long haul holidays or have family in far flung locations!!