time conundrum

I'm sitting at Logan Airport waiting for a plane.

That's really only partially true - I'm waiting, the pilots are waiting, the plane is sitting outside. There are ground delays in Philadelphia that have moved our scheduled departure out two hours so we're waiting for permission to board and take off.

The funny thing is, I just looked at my boarding pass. The departure time shows our new projected departure time of 7:28 PM. The next line shows the expected arrival time, at 7:17 PM. Boston and Philadelphia both live in the same time zone so I don't think time will move backwards between these two cities. That's an oops! a rather interesting defect (in the software).