(Strip Number 653, Original Publication Date: 12 July 1984)
Panel 1: Vicky comes over and tells Michael they're about to preboard when he apologizes for wanting to ask a question about the tag he's wearing with the letters "UM" on it.
Panel 2: He says that he understands that the "M" is for "minor" but wants to know what the "U" means.
Panel 3: Vicky tells him the "U" is for "Unaccompanied."
Panel 4: Michael is relieved to hear that because, as he tells Vicky, his dad told him it meant "Untrained."
Summary: The young lady is probably thought-bubbling "Christ!! What an asshole!!"; it turns out that this is something she'll probably get used to thinking about John because Mike is going to say all sorts of things that undermine John by presenting him as being the very model of the modern hateful imbecile.