Sounds like carrying a pie on an airplane is now a matter of national security, according to this post on the Eye of the Consumerist. A snip:
"That aint't a liquid," said the TSA employee.
"Oh, good," said the man.
We refrained from asking aloud whether cherry pie filling was considered a gel.
"Unless it's sweet potato," she said.
"It is," he said.
"Then I'm gonna have to confiscate it!" said the TSA employee, to general laughter.
I'm glad we had the Thanksgiving feast at our house this year...