Originally Posted by
yonajon
Thanks, so it cannot be known at booking time?
What is the route concerned? Some routes (into Africa for instance) NEVER get these frames. Others (like STN) get them almost always (although not guaranteed). There are about 20 77W frames with full lie flat out of currently 120 in service, so overall an 18% chance.
Using Flightradar24 you can see what frames have historically flown on the route you are interested in. But 'past performance is no guarantee for future success' (as they say in the investment industry).