If the flight was at 2, it was international so I expect they want them at the gate 2 hours early. The islands airports are inefficient, ticketing agents take forever to check things, our tickets are always screwed up.
So to be there at noon, handle luggage, etc, it would take a while. And factored in was probably the expectation that kids would be late, they always are. So they gathered at 1030 expecting to leave at 11 to get to airport around 1115 to 1130 giving them some safe time to lose.
All that makes sense--plus, even considering two flights, it would have still been a big group. Seemed like a lot of time to me but, if my SO were scheduling, he'd probably insist on leaving the hotel at 8 AM for a 2 PM flight. Never know, might have to overhaul the transmission on the way to the airport...