Rowland & Sons Air Transport Service, Inc. has been in operation for three years. The following transactions occurred in February: Feb. 1 Paid $500 for rent of hangar space in February. Feb. 4 Received customer payment of $1,510 to ship several items to Philadelphia next month. Feb. 7 Flew cargo from Denver to Dallas; the customer paid in full ($1,410 cash). Feb. 10 Paid pilots $1,500 in wages for flying in February Feb. 14 Paid $116 for an advertisement run in the local paper on February 14 Feb. 18 Flew cargo for two customers from Dallas to Albuquerque for $2,130; one customer paid $860 cash and the other asked to be billed $1,270 Feb. 25 Purchased on account $1,755 in supplies for future use on the planes