Join Date: May 2002
Location: Pittsburgh
Programs: MR LT Titanium, AA LT PLT, UA SLV, Avis PreferredPlus, HH Gold, Hertz PC, National Executive, etc.
Posts: 31,650
HUACA is in the Glossary, but HUCA is more prevalent IME (and via Search). And both result in hundreds of hits in just the last 6 months, so it's quite common.
Just be aware that some airlines make notes of every call, so if you HUCA, you may be met with "I see you just called on this topic 5 minutes ago".