FLY BY THE SEAT OF ONE'S PANTS

{v. phr.}, {slang} To fly an airplane by feel and instinct rather than with the help of the instruments. * /Many pilots in World War I had to fly by the seat of their pants./

{v. phr.}, {slang} To fly an airplane by feel and instinct rather than with the help of the instruments. * /Many pilots in World War I had to fly by the seat of their pants./