in answer to your question
the air display is paid for from the collections held on the previous carnival, in answer to spell checkers rant, if the carnival wasnt here then the buisnesses in dawlish would be adversly affected by the loss of income, carnival day last yr had 10,000 people to watch the airdisplay at least 90% of those people brought at least a chocolate bar in the town, its a lot of money when u look at it ...