okay...I know that fliers cannot be carried by other fliers. but can someone with the passenger feat use phasing to transport a flier?

-Robert

It's in the November FAQ's rulebook corrections that, when carrying with Passenger, you obey all of the other, normal rules for carrying.

No.

Passenger follows the same rules for carrying as flyers follow. So Passenger cannot be used to carry a flying character.

See the recent FAQ update which clarifies this point on carrying.