The TG record locator might be showing up in SHARES as the 1A record locator, especially if your ticket is operated by multiple airlines on Amadeus. You can try asking UA if they have a 1A locator in their system.
Originally Posted by
oliver2002
If the operating or issuing airline uses Amadeus altea (like TG, AV, LH/LX/OS/SN, SQ, AC, BA, AF, KL, AY, QR etc) then the saudi thing mostly works.
I haven't been able to get a 016 ticket to work since ~1 year after UA/SV cancelled their interline agreement.