Exactly where my head started going... Then "No hang on. The rest of this comment isn't making sense now, back up bak up backup. Oh... _that's_ less interesting." :-)

(Gah - and don't you hate it when people stealth-edit their comments and make you look insane? For the record, the parent originally said "commercial aircraft carriers" instead of "commercial aviation". I may be insane, but there's a completely plausible explanation for this comment thread and it can't be used as evidence of my lack of sanity, ok?)