Marathon Oil lands near Chicago same week fleet visits Midwest refineries

Marathon Oil operated a Gulfstream V (tail N540M) from Demaree Airport to DuPage Airport on May 18, 2026, a brief 39-minute hop across Indiana and Illinois that touched down at 22:48 UTC.

The flight arrives in Chicago’s western suburbs the same week Marathon Petroleum Corporation, a separate entity from the former Marathon Oil, is executing its planned turnaround schedule and capital projects at regional refineries. Marathon Petroleum reported first-quarter 2026 results on May 5, noting that its Garyville jet flexibility project came online in 1Q26 and that the El Paso FCC upgrade and Robinson jet project are targeting completions in 2Q and 3Q 2026 respectively, per a company press release [prnewswire.com](https://www.prnewswire.com/news-releases/marathon-petroleum-corp-reports-first-quarter-2026-results-302762467.html). The Gulfstream's flight pattern over the prior week — shuttling between DuPage, Indianapolis, and central Wisconsin — aligns with visits to Marathon Petroleum’s Robinson, Illinois refinery and logistics hubs.

While Marathon Oil itself is now a ConocoPhillips subsidiary following the $22.5 billion all-stock deal that closed in November 2024 [conocophillips.com](https://www.conocophillips.com/news-media/story/conocophillips-to-acquire-marathon-oil-corporation-in-all-stock-transaction-provides-shareholder-distribution-update/), the N540M flight history suggests continued operational travel tied to the downstream operations that retained the Marathon name. This trip to DuPage looks like another day on the refinery beat.