The B-52 is an American bomber. You might be familiar with it, due to its 8 engines (yes, I'm not joking. This thing had 8 ENGINES). These days they're used on excercises, but back in the 20th century, they were used a lot.
The B-52 had a more than 14,000 kilometre range, but from time to time, when it flew for long missions, it had to refuel in midair. Midair refueling is extremely hard. You have to match your speed with the tanker and you have o be super stable. There was a crash when a B-52 collided with a KC-135 Stratotanker because it was not stable enough. Anyway, in the '70s, B-52s would refuel like this in more-than-45-degree bank angles. Sometimes they would refuel in nearly 90 degree banks. Yes, this means that the B-52 and the tanker had to be at the exact same bank, and had to make sure they didn't put too much pressure on the airframe. When I go at too much of a bank angle even with the Boeing 737-700, it instantly starts plummeting. Remember, they also had to make sure that they didn't put too much pressure on the airframe. They also had to predict the turbulence super early to be able to rotate the yoke as slowly as possible.
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