"Non-refundable deposit" could be $1. In exchange they get their name mentioned in a load of press as being associated with new technology etc., so massively wo

"Non-refundable deposit" could be $1. In exchange they get their name mentioned in a load of press as being associated with new technology etc., so massively worth it for them. Also worth it for Boom as having "orders" from credible airlines makes them look more credible.