Operation Calendar

Operation Calendar in 1942 was an Anglo-American operation in World War II to deliver Supermarine Spitfire fighter aircraft to Malta. The aircraft were desperately needed to bolster the island's defence against strong Axis air raids.
Background.
"Club Run" deliveries required the short-range fighters to be loaded onto an aircraft carrier in Britain or at Gibraltar and taken to within flying range of Malta where they would be "flown off" and make their own way to Malta. There had been several earlier "Club Runs" but by this time, no suitable British carriers were available. The situation was urgent, so, after a personal request from the British Prime Minister, Winston Churchill to the American President Franklin D Roosevelt, the American aircraft carrier was loaned for a "Club Run".
Operation.
"Wasp" collected 52 aircraft from Shieldhall on the River Clyde, from No. 601 Squadron RAF and No. 603 Squadron RAF, with pilots. The aircraft to be conveyed were Spitfire VBs fitted with external fuel tanks to extend their range. They were, however, inadequately prepared. The external tanks leaked badly, a fault that recurred on "Club Runs"; in addition, many of the aircraft's guns were faulty and most of their radios did not work.
"Wasp" sailed from Glasgow on 14 April 1942 with her escort, destroyers and , and was joined by the British battlecruiser and her escort. When this squadron, codenamed Force W, passed Gibraltar overnight on 18–19 April, they were joined by cruisers and and destroyers , , , and . During final preparations, the faults mentioned above were detected, but too late to be rectified.
On 20 April, with "Wasp"s Grumman F4F Wildcats providing air cover, 48 Spitfires flew off.
Aftermath.
This addition to Malta's defences was in vain. The "Luftwaffe" anticipated the Spitfires arrival and bombed Ta'Qali airfield within minutes of their arrival. Most were caught on the ground and within 48 hours all were destroyed. Those that did fly were hampered by the faults with which they had arrived.
The island's Governor, Lieutenant General Sir William Dobbie, reported that the local condition was critical. He was soon replaced; the view was that he should have ensured adequate protection for the Spitfires and for an earlier convoy which had been sunk in harbour. Lord Gort was his replacement. The loss of the Spitfires made the subsequent Operation Bowery even more essential.