S1T1A1C3K5U1P3S1
16 points
STACKUPS is validvalid
STACKUP, an arrangement of circling airplanes over an airport waiting to land [n]
STACKUP, an arrangement of circling airplanes over an airport waiting to land [n]
STACKUP, an arrangement of circling airplanes over an airport waiting to land [n]
STACKUP, an arrangement of circling airplanes over an airport waiting to land [n]