The commemorative flypast at Duxford paired Europe's sole airworthy Boeing B-17 Flying Fortress, "Sally B," with a modern Boeing KC-135 Stratotanker to honor the lineage of the 100th Bomb Group, later redesignated the 100th Air Refueling Wing and still stationed at nearby RAF Mildenhall. For the occasion, the KC-135 wore the Square D tail marking historically carried by the 100th's B-17s during World War II, a rare honor since the unit is the only USAF organization permitted to retain its original wartime tail code across seven decades of re-equipment and mission changes. The event underscores how the "Bloody Hundredth" nickname, earned through catastrophic combat losses over occupied Europe, remains embedded in the unit's institutional identity even as its mission has shifted entirely from strategic bombing to aerial refueling.
For working pilots, particularly those flying heavy iron or tanker variants, this kind of formation flypast is a logistical and airmanship exercise worth studying beyond its ceremonial value. Coordinating a piston-engine, tailwheel, WWII-era bomber with a swept-wing jet tanker demands careful briefing on airspeeds, formation geometry, and abort procedures given the vastly different performance envelopes of the two aircraft. Sally B's operators, the B-17 Preservation Trust, work with a razor-thin margin of airworthy WWII heavies in Europe, making every display flight an exercise in risk management, maintenance scheduling, and regulatory coordination with the UK CAA. Military aircrews assigned to fly historic formation profiles alongside vintage warbirds also get valuable, low-frequency training in visual formation flying and closure-rate judgment that differs significantly from routine tanker operations, where boom and receiver contacts follow rigid, computer-assisted procedures.
The broader significance lies in what these events represent for both commercial and military aviation culture: the deliberate preservation of unit heritage as a tool for esprit de corps and recruitment. The 100th Air Refueling Wing's continued use of the Square D marking, more than 80 years after the original Bomb Group flew it into contested skies, reflects a growing trend across NATO air arms and legacy carriers alike of leaning into historical branding to reinforce institutional continuity amid rapid technological change. Airlines have followed similar patterns with retro liveries, and warbird operators increasingly partner with active military units for joint flypasts, both for public engagement and to keep alive flying skills tied to formation and low-level display work that peacetime jet operations rarely exercise.
Finally, events like the Bloody Hundredth commemoration highlight the precarious state of airworthy WWII bomber preservation generally. With only a handful of B-17s still flying worldwide, and Sally B representing the type's sole flying example in Europe, maintenance costs, parts scarcity, and an aging pool of qualified warbird pilots and mechanics pose long-term sustainability challenges. For corporate and business aviation professionals with an interest in historical aircraft ownership or museum-fleet operations, the economics and regulatory hurdles surrounding continued operation of aircraft like Sally B offer a cautionary case study in what it takes to keep irreplaceable, non-type-certificated aircraft legally and safely airborne for public display well into the 21st century.