Without being 100% sure, it seems every passenger on that plane was returning from a holiday.
If you were on a suicide bombing mission, you'd think that it would make more sense to get it over and done with sooner rather than later.
If that wasn't the case, assuming that they didn't carry it with them on the flight out also, which seems so unlikely as to be more or less impossible, then they'd have needed an assistant on the other side, which is possible of course, but still seems bizarre. More likely, as I said elsewhere, that a non-passenger in Egypt smuggled a bomb on board. But you've got to look at the sheer rarity on this type of incident. When the evidence stacks up in favour of foul play then I'll hastily take my 90p back, but at the moment it would seem to suggest otherwise.