1973. Israel didn't lose it (or win it), but if it weren't for Operation Nickel Grass (one of the largest air re-supply operations in history), it would have lost.
>Operation Nickel Grass was an overt strategic airlift and operation conducted by the United States to deliver weapons and supplies to Israel during the 1973 Yom Kippur War. In a series of events that took place over 32 days, the Military Airlift Command of the U.S. Air Force shipped 22,325 tons of tanks, artillery, ammunition, and supplies in C-141 Starlifter and C-5 Galaxy transport aircraft between October 14 and November 14, 1973.