My first trip to the US about 5 yrs ago with UA on the return leg, lost track of time, raced back to LAX, had to cut in front of 30 people in the security queue, ran all the way to the gate and managed to board. We sat there for 40 minutes until the golden announcement came over "this flight is too heavy, we need 18 people to get off and we'll offer US$1200 in vouchers to each". Hell yes! I don't have to be back in Aus for anything.
We got off and for the next hour it took them to organise the vouchers, that flight sat there.
UA couldn't find hotel rooms for us (even I started calling around for them).
I ended up going back to a mate's.
UA offered to put us on a QF flight the next day, instead, I asked to go on a UA flight 2 days later, but upgrade me for the trouble. Done deal!
(plus 8000 points for not being able to find me accommodation).
The flight crew on my return trip were the ones from the original flight, they said it was something to do with the cargo, it was heavy and urgent which is why they paid so much to get us off.
Used the voucher to fly back to the states a year later, the combined points from these two trips was enough to fly me and a mate MEL-BKK in J