Dream driver
It's a one off payment on your first day to help you along.
Expenses are based on the cost of purchasing food at the hotel down route. It is layover dependant not type (although I suppose you could say type is an indirect cause as the 320 is unlikely to go to JFK
). The system knows how long you are at the hotel and will add an amount per relevant meal period into your salary.
It's then up to you to decide if you wish to dine on caviar threaded with gold for brekkie or nip down to the nearest shop instead.
