Burger Baby restaurants engaged Air Advertising to fly an advertisement above the Connecticut beaches. The advertisement offered $1,000 to any person who could swim from the Connecticut beaches to Long Island across Long Island Sound in less than a day. At 10:00 A.M. on Saturday, October 10, Air Advertising’s pilot flew a sign above the Connecticut beaches that read: “Swim across the Sound and Burger Baby pays $1,000.” On seeing the sign, Davison dived in. About four hours later, when he was about halfway across the Sound, Air Advertising flew another sign over the Sound that read: “Burger Baby revokes.” Davison completed the swim in another six hours. Is there a contract between Davison and Burger Baby? Can Davison recover anything?