The Boeing B-52 Stratofortress has already been in service for 71 years, while the oldest B-52 airframes in USAF service are now 66 years old. This is far older than almost any aircraft in the world ever reaches in active service. But instead of looking at an upcoming retirement, these old airframes are about to get a facelift that will keep them in service until the 2050s and possibly into the 2060s.

This means these aircraft are only around two-thirds of the way through their expected service lives. This is an incredible feat for any aircraft and a testament to what it takes to survive. The B-1 Lancer is supersonic, while the B-2 Spirit is stealthy; the B-52 is neither, yet it is the missile delivery truck the US Air Force wants for its future bomber fleet operating alongside its next-generation B-21 Raider.

Early Cold War Origins Of B-52

The B-52 Superfortress « BUFF » is one of the oldest aircraft types in service with any modern air force. The aircraft was designed by Boeing in the early Cold War, with groundwork beginning soon after the end of World War II. Design for the aircraft started in earnest in 1948, with a full-size mock-up being built in 1949. This makes the B-52 program about as old as the US Air Force itself, which was established as a separate service branch in 1947.

Thanks in part to interventions by General LeMay, Boeing received the contract for 13 B-52As in February 1951. Ground testing began later that year, with the first prototype, XB-52, first flying in April 1952. The US Air Force was so impressed by the new aircraft after more testing that it increased its order to 282 B-52s. The design changed to the B-52B, with only three of the original 13 planned B-52As being built, all of which were used for testing.

The B-52 would enter service in 1955, shortly after the conclusion of the Korean War, and Boeing would go on to acquire a total of over 740 B-52s. The age of the B-52 can be seen in its eight-engine design. It was designed for the transition from propeller-driven engines to jet engines. However, these jet engines were underpowered and unreliable, and so eight were needed. Today, four would be sufficient and provide redundancy.

The B-52 Variants

As mentioned, three B-52As were produced and used for testing. The first variants to enter operational service were B-52Bs, of which 50 were produced. A total of 35 B-52Cs, 170 B-52Ds, 100 B-52Es, 89 B-52Fs, 193 B-52Gs, and 102 B-52Hs were built for a total of 742 (it’s unclear what the other two aircraft variants were). Production ran from 1954 to 1963, with three aircraft delivered in the first year, ramping up to 13 in 1955, then to 41 in 1956, 124 in 1957, before peaking at 187 in 1958.

Production tapered off, mirroring its ramp-up, with 129 delivered in 1959, 106 in 1960, 57 in 1961, 68 in 1962, and finally 14 in 1962. All of these B-52 variants, except for the B-52H, have been retired. The last B-52Gs were retired in 1994 after the Cold War came to an end. The B-52Hs were delivered between 1961 and 1963, with 20 being delivered in 1961, 68 in 1962, and 14 in 1963.

The B-52H has the same crew and structural improvements as the B-52G, although it comes with the modernized TF33-P-3 turbofan engines, which offer a major improvement over the older J57 turbojets found on the older aircraft. That said, while these engines may have been a major improvement for the time, they are now aging and are in need of replacement.

Exceptionally Old Airframes

The B-52 is old in a way no other aircraft, other than the KC-135, in the US Air Force is old. Other long-lasting aircraft programs remained in production for extended periods. For example, the venerable Lockheed U-2 Dragon Lady spy plane entered service in 1956 and remains in service today. However, these two notable factors set it apart from the B-52. One factor is that the remaining U-2s are poised for retirement by 2030.

The second factor, the Dragon Lady, remained in production for much longer. The first aircraft may have been produced in 1955 (71 years ago), but the last one wasn’t delivered until 1989 (37 years ago). The 30 or so U-2s that remain in service were built in the 1980s and are now about 40 years old. This makes the airframes old, but not exceptionally old. By contrast, the final B-52 was delivered in 1962, making the newest Stratrofortress airframe 62 years old.

This is also similar to the Lockheed C-130 family of tactical airlifters. The first aircraft was built in 1954, but the type remains in production as the upgraded Lockheed Martin C-130J Super Hercules, meaning the newest airframes are brand new. The one aircraft similar to the B-52 is the KC-135 Stratotanker. The oldest KC-135 tanker in service is now 69 years old, having been first delivered in 1957. That airframe is likely older than any other B-52 airframe still operating.

Outliving The Successor & Successor’s Successor

Remarkably, the Air Force has decided these aging B-52Hs should outlive their erstwhile replacement, the B-1 Lancer. The remaining B-1s are expected to start retiring in the late 2020s before disappearing in the early 2030s. Then the Air Force plans to retire the B-1 Lancer’s erstwhile replacement, the B-1 Spirit, perhaps in the late 2030s. How these aircraft are retired depends largely on how the B-21 Raider program progresses and when the Air Force has enough B-21s to replace these older bombers.

Despite its age, the Air Force sees the B-52 as a critical part of its future bomber fleet. The War Zone writes, « The Air Force otherwise sees the B-52 as a key element of its nuclear and conventional long-range strike capabilities through at least 2050, including in a potential high-end fight against China in the Pacific. » While the Air Force has said it wants the B-52s flying into the 2050s, some suggest the Air Force will keep them flying as late as the 1960s.

Stars and Stripes wrote, « The upgrade is expected to keep the B-52H — delivered in 1961 and 1962 — flying as late as the 2060s. The Air Force said some planes could surpass 100 years in service. » This would mean that not only would the B-52 type remain in service for over 100 years, but also some airframes could remain in service to see their 100th birthday.

Upgrading The B-52H To A B-52J

As stated, the B-52Hs are being updated to the new B-52J standard as part of the original Commercial Engine Replacement Program (CERP). This will replace the old TF33-P-3 turbofan engines with modern F130 engines. F130 is the military designation of the Rolls-Royce BR700, which powers business jets like the Bombardier Global Express and the Gulfstream V.

The Air Force is planning for the first to be delivered in 2028, with the last B-52Hs re-engined by 2035. The engines are being replaced one-for-one, so the B-52Js will also have eight engines. The old bombers will also receive an array of other upgrades. The most significant non-engine upgrade will be replacing the aircraft’s old 1960s-era radar with a modern Active Electronically Scanned Array (AESA) radar, namely the AN/APG-79B4.

That is a variant of the radar found in the Super Hornet. Another improvement is to include a digital « glass cockpit » for the flight deck, stripping the 1950s dials and gauges and replacing them with modern displays. Other improvements include new Integrated Drive Generators (IDGs), new communications to allow it to be a node in a modern networked battlefield, a reduced crew of four (down from five), and the ability to carry future munitions.

Why The B-52 Survives To 100

The B-52 has survived as the US bomber for 100 years for many reasons. One is the comparatively low operating cost of the aircraft relative to other aircraft, like the B-2. Another factor is that the airframes still have many flight hours left, at least after retrofits, while the B-1 Lancer airframes are wearing out. One big factor is that the B-52 has proven to be a versatile platform that has evolved.

The B-52 was designed to fly over a target and drop dumb bombs WWII-style; it was even built with anti-aircraft machine guns for defense. Those days are long behind it. The B-52 is the direct opposite of stealthy and maneuverable and has almost no ability to survive in modern high-end conflict and contested airspace.

Instead, it will be a « missile truck » carrying and launching hypersonic missiles and other LRSO (Long Range Stand-Off) precision guided munitions outside the danger zone. It will also be able to continue its nuclear deterrence role. Meanwhile, the much smaller Northrop Grumman B-21 Raider will be the ninja penetrating enemy air defense and carrying out precision targeting strikes.