Ditto, airport security called it a breathing apparatus. Took us aside, put it in some sort of hood/machine to scan it. Then called my husband over, made him plug it into a wall outlet and turn it on.
On a side note, a friend of mine went to an education day where an airline official gave a talk on travelling with the vest, nebs, etc. Suggested a certain type of carry one bag with wheels. She and her family make reservations to travel to mexico on that same airline and they gave her NOTHING but grief about her daughter's vest. Kept insisting she check it, were going to charge her for an extra checked bag...
On a side note, a friend of mine went to an education day where an airline official gave a talk on travelling with the vest, nebs, etc. Suggested a certain type of carry one bag with wheels. She and her family make reservations to travel to mexico on that same airline and they gave her NOTHING but grief about her daughter's vest. Kept insisting she check it, were going to charge her for an extra checked bag...