Delano's irreverent sense of humor was subtly expressed in some his architectural details and friezes, such as the low-relief frieze of tortoises and hares in the apartment block at 1040 Park Avenue, and backgammon club rooms ornamented like backgammon boards. At the Marine Air Terminal at LaGuardia Airport, built for Pan American Airways' transatlantic seaplane service in 1939 and the oldest such passenger air facility still in use, his Art Deco terra cotta friezes feature flying fish. "There is as much that is new to be said in architecture today by a man of imagination who employs traditional motifs as there is in literature by an author, who, to express his thought, still employs the English language," Delano wrote in 1928.