I was at the Baltimore-Washington International Airport (BWI) last week. As is common these days, there was a template for how big a carry-on bag could be in the public area in front of the ticket counters. This particular one was supplied by British Airways and what was unique about it was that it had an integral spring scale so you could weigh your carry-on bag as well as check size. The scale was in KILOGRAMS only. Weight limits were posted for various types of aircraft, such as the Concorde; the weight limits were metric first with WOMBAT in parenthesis e.g. 6 kg (13 pounds), all rounded values. Also in wandering around waiting for my flight, I read a placard on one of the America West gates that displayed prohibited and dangerous items that could not be transported unconditionally by air. The only exact quantity specified (some things were like "no compressed gasses, except small quantities as personal toiletries") was sporting ammunition, which was limited to 5 kg (as cargo), no WOMBAT equivalents. Slow but steady progress. Paul
