<p>i forgot to sign up for an airport shuttle, and now all viable shuttle times are full for my departure and arrival. is it likely that there will still be space for me if i just show up? during thanksgiving, they didn't even check for a receipt, but are their christmas policies more stringent?</p>
<p>just go for it -- and start early, in case they're full and you have to try your luck with the following shuttles.</p>
<p>They don't check tickets. As long as there's room, you can get on. Also, you can take the 30 and then the 994 as a last resort.</p>
<p>It's a little late now, obviously, but for next time: I'm a sophomore, and I've taken the shuttle to and from the airport every major holiday, and they have never checked the tickets. </p>
<p>I think they have the reservation system for two reasons. 1) so they have an estimate of the demand, and 2) so if they are completely filled, beyond capacity (which has never happened, as far as I know), they have a "fair" way to cut the number of students who can get a ride</p>