Trying to book a colleague onto the BA788 LHR - GOT for Sunday 17th May, 1435hrs departure. I already have one colleague on it, but now two need to travel.

However, can only get ba.com to show one flight for that day, on a 06.20hrs departure.

Could this mean the flight is full and no longer available, in any class? I looked at the previous Sunday, and it's offered on that date.

Or is BA removing certain flights for sale which they plan to cancel imminently, to save fuel?!

Any ideas? Really want my two colleagues to travel together!