FARNBOROUGH, UK — Boeing is quietly pitching the U.S. Air Force a new F-15 fighter jet using the same business strategy that convinced the Trump administration to buy more Super Hornet warplanes for the Navy.

Dubbed the F-15X, the new variant of the venerable jet offers more modern flight controls, cockpit displays, and radar, according to military and industry sources with knowledge of the plan. The plane would also pack a lot of firepower, carrying more than two dozen air-to-air missiles, the most of any U.S. Air Force aircraft.

Boeing officials declined to explicitly confirm their efforts to sell the F-15X, except perhaps obliquely:

“We see the marketplace expanding internationally and it’s creating opportunities then to go back and talk to the U.S. Air Force about what might be future upgrades or even potentially future acquisitions of the F-15 aircraft,” Gene Cunningham, vice president of global sales of Defense, Space & Security, said Friday at the Royal International Air Tattoo in England.

The Air Force has not purchased new F-15s since placing a 2001 order for five F-15E Strike Eagles, a two-seat version that can bomb ground targets and shoot down other aircraft. The original F-15 first flew in 1972, and many of the Air Force’s current air-to-air Eagles entered service in the 1980s. Many of them are older than the pilots who fly them.

Unlike its successful Super Hornet pitch to the Trump administration last year, the F-15 pitch has not made its way to White House, according to sources with knowledge of the project. When Trump visited a Boeing commercial factory in South Carolina in February 2017, reporters traveling with the President spotted then-Chief of Staff Reince Priebus with a Boeing white paper that compared an advanced version of the Super Hornet to the F-35 Joint Strike Fighter made by rival Lockheed Martin.

Air Force leaders say they are currently evaluating their mix of aircraft.

“We have a new National Defense Strategy and the Air Force is working through the process of determining what Air Force is needed to meet that new National Defense Strategy and how do you represent that to the world, Gen. James “Mike” Holmes, the head of Air Combat Command, said June 28 at a Defense Writers Group breakfast in Washington.

Among the options being considered are new versions of F-15s and F-16s, according to one Air Force observer.

American allies Israel, Saudi Arabia, Singapore, and South Korea fly tailored versions of the F-15. The newest member of the Eagle club is Qatar, which ordered 36 aircraft last year and has an option for 36 more. Boeing is also pitching the F-15 to Germany, which wants to replace its Tornado jets.

Boeing’s Cunningham, said the firm is also offering upgrades to existing F-15s with technology used in the newer ally aircraft.

The F-15 is considered a fourth-generation plane, one that does not have a stealth design, which helps it evade enemy missiles. For more than a decade, Air Force leaders have long pressed for buying only stealthy fighter and bomber aircraft. Buying new F-15s would reverse that.

“This is the most traction I’ve ever seen legacy four [generation aircraft] get in the Air Force,” the Air Force observer said.

The F-15 was supposed to be replaced the by the stealthy F-22 Raptor — considered the top air-to-air combat fighter. Despite objections from top Air Force generals, then-Defense Secretary Robert Gates ordered an end to F-22 production in 2009. The final jet came off of Lockheed Martin’s Marietta, Georgia, production line in 2012. In all, the Air Force purchased 187 Raptors, far less than the more than 750 originally planned.

At the time, Gates opted to invest in the F-35 Joint Strike Fighter, a multi-role fighter, which can shoot down planes and attack targets on the ground with its array of advanced sensors, radar and sensors.

Foreign versions of the F-15 have received newer technology not around when the American planes were built. Over the years, U.S. F-15s have received upgrades to their radars and cockpits, but the Air Force recently canceled an effort to add electronic jammers to its older F-15Cs. Some Air Force observers said that indicates the service might retire the plane sooner than planned.

Boeing has long pitched new versions of the Strike Eagle to the Air Force and international customers. In 2010, the firm pitched the Silent Eagle — an F-15 with special coating and canted vertical tails — that executives said could better evade enemy detection. In 2015, it pitched an upgrade to the F-15C — the aerial combat version — that would allow it to carry 16 air-to-air missiles.

At times, Boeing has argued that upgraded versions of their planes could come close to matching the advanced stealth, sensors and electronic warfare capabilities of the F-35 at a fraction of the cost.

Now the savings might not be as much as the price tag of the Air Force F-35 has been dropping annually. The Pentagon on Sunday announced it has a handshake agreement with Lockheed Martin for a new batch of 141 F-35 Joint Strike Fighters. The Air Force version of the plane cost about $89 million per copy, according to a Reuters.

An Air Force source noted that buying new F-15s now would not be seen as competing with the F-35 since the the Joint Strike Fighter has never been considered a replacement for the F-15.