you are correct about each of the SOL's. If you can convince a court the 2 years is applicable, the suit should get tossed.
the specific law you would be interested in is 47 USC 415
http://law.onecle.com/uscode/47/415.html
Sec. 415. Limitations of actions
(a)
Recovery of charges by carrier
All actions at law by carriers for recovery of their lawful charges, or any part thereof, shall be begun within two years from the time the cause of action accrues, and not after.

