Mary Peters - Transportation Secretary

Article I, Section 8, Clause 3:
The Congress shall have power . . . To regulate commerce with foreign nations, and among the several states, and with the Indian tribes;

Facilitating inter-state commerce is a core function of the Federal Government. This, of course, directly applies to interstate infrastructure like airlines/airports, seaports/shipping lanes, railroad, and interstate highways.

It's really a no-brainer and has been held up in Supreme Court rulings for over 200 hundred years.