When we operated through Bangor, there were occasions when lobsters made the trip back to the UK. They were packed in polystyrene boxes to make the trip. On one trip back I had two lobsters in a box, claws with rubber bands round them, but they were very much alive. This was confirmed when I placed a lobster on the lap of a Cabin Crew member who was having a rest on the L1 Jump Seat.
Temps