I'm a long-term user of GF and pretty comfortable with the way it works as well as its little idiosyncracies

One thing I've not been able to figure out though:

• using the "Airlines" button and selecting "Star Alliance" works fine, and inserts "a:STAR_ALLIANCE*STAR_ALLIANCE;" into the page URL
• the results of any search are then correctly restricted to flights marketed and operated by Star Allliance members - so far, so good
  
• continuning by choosing "United Airlines ¦ only" logically enough substitutes "a:STAR_ALLIANCE*STAR_ALLIANCE;" with "a:UA*UA;" in the URL
• to my mind, this should mean something like "restrict to <marketing carrier=UA> and/or <operating carrier=UA>..

I have tried all 4 combinations:

1. "a:STAR_ALLIANCE*STAR_ALLIANCE;"
2. "a:STAR_ALLIANCE*UA;"
3. "a:UA*STAR_ALLIANCE;"
4. "a:UA*UA;"

however, the list of results seems unchanged in all 4 cases and are NOT restricted to UA-marketed flights NOR those operated by UA (e.g. there's always a ton of LH flights in there)

I guess what I'm looking for is an equivalent to "O:UA" in ITA Matrix - anyone know how to acheive that in GF ?

Thanks in advance