You know what makes me laugh here is that United Airlines is still using such a code system in the first place.
These codes were established decades ago when teletype machines were in use for much the same reasons we have abbreviated weather codes in METARs and TAFs.
The whole thing was designed to reduce transmission time and to mitigate bandwidth constraints caused by the technology of the era. It was also designed to save paper.
Now that we live in an age of paperless cockpits, ticketless travel, and high bandwidth communications this is all obsolete.
I guess maybe my dispatch releases, company notams, and load sheets may be a bit longer but I can read them twice as fast.