Comcast Corp. says for security, certain senior executives must use company planes for business and personal travel. Last July, the cable giant bought a third jet for its fleet, a new Dassault Falcon 900 that can cost upwards of $40 million. The plane was needed, a spokesman said, because the company anticipated more business travel after its acquisition of NBC Universal.

By year end, nearly two thirds of the plane's flights were to or from those and six other resort destinations, including Augusta, Ga., Big Sky, Mont., and the Hamptons. (See results in the database.) Over the full four years, 42% of flights made by the Comcast fleet were to or from resort areas, among the highest percentage for the companies reviewed by the Journal.