DALLAS: Delta Air Lines Inc will drop a lawsuit against Republic Airways Holdings Inc and provide $75 million in credit to help Republic rebuild under bankruptcy protection. As part of the settlement, Republic will stop flying small, 50-seat planes for Delta but continue to operate larger jets that are more economical. Republic is a key contractor for Delta Connection, which flies between major hub airports and secondary cities. Delta sued Republic last year, claiming that the contractor — which was dealing with a pilot shortage — had cancelled some Connection flights.