Icare9 From what I've read the USAAF B-17s usually bombed from between 20-30,000' They had a maximum ceiling of approx 35,000' but they wouldn't have got that high with a full bombload and fuel. The Halifax IIIs and the Lancasters bombed from around 20-23,000' with the poor old Stirling absorbing the flak at 17,000'.