Continuing from the above source:

Third Excerpt: Service Animal Relief Areas
Inter-terminal and intra-terminal transportation owned, leased, or controlled by a carrier at a U.S. airport must meet DOT ADA rules. Since DOT has already incorporated the new version of ADAAG into its regulations, the new ADAAG's provision will apply to any features covered by the DOT rules. One new requirement at U.S. airports is to provide, in cooperation with the airport operator, animal relief areas for service animals that accompany passengers who are departing, arriving, or connecting at the facility.

Fourth Excerpt: Escort to Relief Area - documentation required?
Another addition, applicable only in U.S. airports, is that a carrier would, on request, and in cooperation with the airport operator, have to escort a passenger to a service animal relief area. Finally, carriers would have to assist passengers with disabilities in transporting their carry-on or gate-checked luggage to or from the gate. This obligation would arise only if the passenger could make credible verbal assurances of his or her inability to carry the item due to his or her disability. If the passenger's verbal assurances to the carrier are not credible, the carrier may require the passenger to produce documentation as a condition of providing the service. All the services mentioned in this paragraph would be provided only on request of a passenger with a disability.

(I do have all that documentation.)

~S~