On 28 March 2018, a Boeing 767-300 and a Boeing 737-700 were being simultaneously pushed back in darkness from adjacent parking positions as cleared when their respective tailplanes collided causing substantial damage. The comprehensive Investigation found that the 737 clearance conflicted with both a previously-issued clearance to the 767 aircraft and with the actual location of the 737. It also found that the controller’s error had been compounded by the wing walkers tasked with external monitoring of both pushbacks being in the drivers’ cabs because it was raining and a context of systemic ramp operations inadequacy was identified as contributory.