TUCSON — The first plane to be designated as Air Force One now sits in a southern Arizona field that’s part of Marana Regional Airport.

The aircraft that once spirited President Dwight D. Eisenhower on cross-country voyages is nearly forgotten on a 10-acre parcel, decaying under the relentless glare of the sun.

“I think it’s one of these big secrets that, really, few people know that it’s out there,” airport manager Steve Miller told The Arizona Daily Star. “It’s sad that it’s just sitting out there, considering its history over the past 70 years.”...