On 5 September 1963, Phisit took off from Vientiane on a flight to Savannakhet Province in Laos, with fellow Thais Prasit Promsuwan and Prasit Thanee, Chinese Y.C. To, and Americans Eugene DeBruin, Joseph C. Cheney and Charles Herrick.
During this flight, about ten minutes shy of the drop zone, while flying at 8,000 feet, the C-46 was hit by antiaircraft fire; its right engine caught afire.