Funny you should say this, I had a friend who missed his flight because of his old Lumedyne batt pack and flash.
The batt pack is pretty weird looking and was drained, so he couldn't "flash on demand". They made him plug it in and charge it to "prove" it was a flash pack.
This was just enough to make him miss his plane.
Now the interesting thing was, he was not mad about it at all. He thought it was great that when they saw something they thought was strange they made a stink about it.
Originally posted by Pete Biro:
It is no easier for us travelling pro photographers... lotsa battery chargers and goofy electronic stuff... glad I'm semi retiring and knocking out my weekly flying.