rememberPassanger Thread - TrAInsported

Sorry for a stupid question, but I am not familiar with lua.

I store in rememberPassanger all the passengers the have been spawned.
I do it the way it's done in the wiki.
My problem is, that i do not know how to acces the passengers without knowing the names. Does something exist like an iterator?
Another possibility would be to store numerical, but that wouldn't be efficient when deleting a passenger an opponent picked up.
Or other way around, is it possible to acces an table element with different keys? One time per ID, the other time per Passanger name?

for name, passenger in pairs(passengerList) do
print(name.." is waiting at ("..passenger.x..", "..passenger.y..")")
end

Okay, thx for the answer!

- can be closed!