Earlier quoted context omitted.
I wonder if it’s limited to 2 letters.
A lot of smaller platforms I've worked with, before address validation became a standard library to pull in, would have a two character field for state if they were developed in the USA. Most things developed outside the USA tend to put no limit on it. For Concur I think it was built on top of the limitations of the global platforms most airlines use that were designed a long time ago for mainframes that didn't have…
My mother saw her return ticket was heading to Melbourne VI and assumed it meant gate 6 at Melbourne airport. It didn't. Fortunately there's no real significance to the return gate at Melbourne airport for an international flight, so it didn't affect me picking her up.