a number of ''check-in'' personnel lack the basic understandings of Int'l travel, and their software provides no clear guidance......as a result, they tend to dig-in and overreach their authority.....you have to get a manager involved......several years ago, an agent was denying my boarding to Argentina because I did not have a visa....non required, but she was convinced I had to have one....I had the Reciprocity Agreement ( remember those?), but she was intransigent....you can NEVER convince people who don't know what they're talking about that they don't know what they're talking about.