There must be a very empty flight somewhere

I’m currently reading a very funny travel book “Ruinair: How to be treated like shite in 15 different countries... and still quite like it” (no prises for guessing which blue, white and yellow, Irish based, low-cost airline is the target).

One thing that keeps coming across is the concept of the “Load factor” that’s the number of seats sold on a flight. Ryanair and easyJet both coming in at the mid 80%’s

Which is odd, as the last few times I have flown easyJet the planes have been almost, if not actually, 100% full.

So who’s on the easyJet flight where there is only one other passenger?