4 dead as U.S. military refuelling plane crashes in Iraq

The U.S. Central Command said the crash followed an unspecified incident involving two aircraft in “friendly airspace,” and that the other plane landed safely.

The U.S. military says a KC-135 refuelling aircraft supporting operations against Iran crashed in western Iraq, killing four of its six crew members.

The U.S. Central Command, which oversees the Middle East, said the crash followed an unspecified incident involving two aircraft in “friendly airspace,” and that the other plane landed safely.

Here’s what is known so far about the tanker, which is the fourth publicly acknowledged U.S. aircraft to crash during the war against Iran:

The KC-135 Stratotanker is a U.S. Air Force aircraft used to refuel other planes in midair, allowing them to travel longer distances and maintain operations longer without landing. The plane is also used to transport wounded personnel during medical evacuations or conduct surveillance missions, according to military experts.

Based on the same design as the Boeing 707 passenger plane, the tanker has been in service for more than 60 years, supporting the U.S. Air Force, Navy and Marine Corps as well as allied aircraft, according to an Air Force description. The aging plane is set to be gradually phased out as more of the next-generation KC-46A Pegasus tankers enter service.

Despite upgrades over the years, the KC-135s’ age has fueled concern about their reliability and durability.

“The last of these planes were produced in the 1960s,” said Yang Uk, a security expert at South Korea’s Asan Institute for Policy Studies. He added that the transition to the KC-46A has progressed more slowly than expected.

According to the Congressional Research Service, the Air Force last year had 376 KC-135s, including 151 on active duty, 163 in the Air National Guard and 62 in the Air Force Reserve.