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The US President, Harry Truman, authorised the first overflight on 5th Aug 1948 when an RB29 took-off from Ladd AFB and, after routing over Siberia and spending over 19 hours in the air, eventually landed at Yokota AB in Japan. Even longer flights soon became routine with aircraft operating up to 35,000ft, covering 5000 miles and remaining airborne for occasionally up to 30 hours. Although the Soviet Military was equipped rudimentary radar, copied from WW2 US supplied equipment, large gaps existed in their radar coverage, particularly over the vast Arctic region. These gaps were soon identified and exploited by the RB-29s as they penetrated deeper and deeper inside the Soviet Union. Although they were detected on many occasions, none of the RB-29s was ever intercepted because the early MiG-15 was the only fighter with sufficient performance to reach these high-flying aircraft and none of the new fighters were then stationed in Siberia.