BUR #52594 has been approved by @evazion.
create implication the_cockpit:_sonic_boom_squadron -> the_cockpit
create implication the_cockpit:_knight_of_the_iron_dragon -> the_cockpit
create implication the_cockpit:_slipstream -> the_cockpit
The Cockpit is a series of 3 OVAs all with different characters about different battles and the like, hence them already having separate tags to begin with, so implying them all to the series tag.