空中給油機 (Tanker Aircraft)

What Is a Tanker Aircraft?

A tanker aircraft is a military aircraft equipped with fuel storage tanks and transfer systems that enable it to transfer fuel to other aircraft while both are airborne. By extending the effective range of receiver aircraft far beyond what their internal fuel capacity would allow, tankers are force multipliers of strategic importance — enabling combat aircraft to reach distant targets, remain on station longer, or return safely after expending more fuel than anticipated in combat operations.

How It Works

Modern tanker aircraft use two primary aerial refueling systems, and many tankers are equipped with both to serve different receiver aircraft:

• Flying Boom: A rigid telescoping tube operated by a boom operator aboard the tanker, who maneuvers it into a receptacle on top of the receiver aircraft. Used by USAF aircraft. Allows high fuel transfer rates (up to 6,000 lb/min on the KC-135).
• Probe and Drogue: A flexible hose with a basket-like drogue is deployed from the tanker; the receiver aircraft's fixed or retractable probe must be flown into the basket by the receiver pilot. Used by US Navy, Marine Corps, and most NATO allies.

Tankers typically carry massive internal fuel loads — often exceeding their own structural weight in fuel — and are based on large commercial or military transport airframes to maximize capacity.

Key Aircraft Types

The Boeing KC-135 Stratotanker, based on the 707 airframe, has been the USAF's primary tanker since 1956 and remains in service today. Its successor, the Boeing KC-46A Pegasus (based on the 767), entered service in 2019. The Airbus A330 MRTT (Multi-Role Tanker Transport) serves over a dozen air forces worldwide. The McDonnell Douglas KC-10 Extender (based on the DC-10) gave the USAF a high-capacity tanker. Russia operates the Ilyushin Il-78 Midas, while many smaller air forces use modified transport aircraft or buddy-store refueling pods on tactical aircraft.

Industry Significance

Aerial tankers are among the most strategically valuable aircraft in any air force inventory. A single KC-135 can extend the range of an entire squadron of fighters by thousands of miles, compressing geography in ways that fundamentally change military planning. The competition to replace aging KC-135s with the KC-46 became one of the most contentious procurement battles in US defense history, with Boeing and Airbus competing for a $35 billion contract. Modern tankers increasingly serve dual roles — the A330 MRTT and KC-46 can simultaneously conduct tanking operations and carry passengers or cargo, making them true multi-role platforms.