Can I purchase an A or Z fare or do I have to use a travel agent? I put my itinerary(TYS-GVA through EWR) on the UA website on the advanced search page and when I put in the fare class, the site came back with: "We were not able to find any available seats meeting your requirements. You may modify your search criteria, or call 1-800-UNITED-1 (1-800-864-8331) within the U.S. or Canada; elsewhere contact your local United Reservations Office."
Since the TYS-EWR segment is only economy I went back and entered just the EWR-GVA segment, with class A or Z, and it still came back with the above Not Found.
I contacted flyl4l, they did not like my Departing city either.