This may sound like a stupid question, but what does 'pax' mean? I presume it's something like 'traveler' or 'client' or something similar, but was really curio

This may sound like a stupid question, but what does 'pax' mean? I presume it's something like 'traveler' or 'client' or something similar, but was really curious what it was short for / meant. As for the rest of your post, it was really interesting: I had no idea that there was so much involved in handling a UM (an acronym I learned about 5 minutes ago :) ).