Whoa!
Please allow me to inject a note of caution here.
As most investment advertisements quote in the fineprint "past performance does not guarantee future results".
Bypass' 20 hours of "overtime" is a cyclical thing. A few months ago you could, if you wished, get all the "overtime" you wished on the 'bus and the guys on the Boeing got very little. With the introduction of several new long and ultra-long haul operations on the Boeing the situation has changed. Also the 'bus no longer operates DXB/HAM/JFK, Manila is now on the Boeing as are all the LHR, MAN, CDG and DME flights and lets not forget that the 'bus used to operate double-daily direct JFK.
Two things to consider:
1) Most of the new ULR flights require you spend more time in flight than at the layover hotel - a situation that I surmise is physically (from a health standpoint) unsustainable over the medium-to-long term.
2) There are 58 BUFF's waiting in the wings that over the next few years will start to pick-up some of the long and medium haul routes currently operated by the Boeing (JFK, LHR, etc).
IMHO you should plan on the basic salary and treat any productivity pay as an unexpected windfall.
Scaglietti