On May 1, 1960, a U-2 spy plane was shot down by the Soviet Air Defence Forces while performing photographic aerial reconnaissance deep into Soviet territory. On April 28, 1960, a U.S. Lockheed U-2C spy plane, Article 358, was ferried from Incirlik Air Base in Turkey to the US base at Peshawar airport by pilot Glen Dunaway. Fuel for the aircraft had been ferried to Peshawar the previous day in a US Air Force C-124 transport. A US Air Force C-130 followed, which carried the ground crew, mission pilot Francis Powers, and backup pilot Bob Ericson. On the morning of April 29, the crew in Badaber was informed that the mission had been delayed by one day. As a result, Bob Ericson flew Article 358 back to Incirlik and John Shinn ferried another U-2C, Article 360, from Incirlik to Peshawar. On 30 April, the mission was delayed one more day because of bad weather over the Soviet Union. On 1 May, Captain Powers left the base in Peshawar on a mission with the operations code word GRAND SLAM. Four days after Powers' disappearance, NASA issued a very detailed press release noting that an aircraft had "gone missing" north of Turkey.