Marathon Oil Gulfstream V returns to Chicago area after a week of legal filings in Wisconsin

A Gulfstream V registered to Marathon Oil (N540M) flew 26 minutes from Dane County Regional Airport in Madison, Wisconsin, to DuPage Airport outside Chicago on May 25, covering barely 100 miles. The short hop, climbing no higher than 9,800 feet, arrived at 7:35 a.m. local time.

That same week, Marathon Petroleum Corporation — the refiner that operated the Marathon Oil fleet under a time-sharing agreement — was defending a shareholder derivative lawsuit in Dane County Circuit Court, per court records. The suit, filed in 2025, alleges board members breached fiduciary duties in connection with a 2024 compensation plan. Marathon Petroleum has moved to dismiss the case, with oral arguments heard in Madison on May 22, according to filings [sec.gov](https://www.sec.gov/Archives/edgar/data/1510295/000151029525000039/mpc-2025331xex101.htm).

The Gulfstream V has shuttled repeatedly between the Chicago area and Wisconsin over the past week: four roundtrips between DuPage and Dane County since May 18, records show [celebplanes.com](https://www.celebplanes.com/celebrity/marathon-oil). The aircraft, based at Houston Intercontinental, appeared to be supporting executive travel tied to the litigation rather than Marathon Oil’s usual operational hubs in Oklahoma City or Minneapolis.