Interesting bit of trivia.Salazar did lease bases in the Azores to the Allies IOTL- the ports of Horta and Ponta Delgada and the Lagens and Santana airfields. The agreement was signed in August 1943, and Coastal Command ASW operations out of Lagens began in October. The Azores were also used as a refuelling point for transatlantic USAAF Air Transport Command flights, and I think as a base for destroyers.
Salazar did lease bases in the Azores to the Allies IOTL- the ports of Horta and Ponta Delgada and the Lagens and Santana airfields. The agreement was signed in August 1943, and Coastal Command ASW operations out of Lagens began in October. The Azores were also used as a refuelling point for transatlantic USAAF Air Transport Command flights, and I think as a base for destroyers.
If they were British I think this would just start earlier (with the attendant effects on the Battle of the Atlantic) and more ports would be used.
In short... basing aircraft out fromt he azores would close the air gap for the transatlantic convoys in the early part of the war.. as well as providing a refueling base for teh relatively short legged DE's available (why corvettes were so important originally).
A considerable amount of pressure was placed on the Portugese to allow the use as a base but they refused intil 1943 - it being a breach of their neutrality - so, reduced shipping losses and increased u-boat losses (once the air launched asw weapons were available).
Convoy routes - the main routes using the north atlantic were closer to the u-boat bases, by routing south within aircover of the azores then the airgap does shrink substantially alongside the shrinkage of operational time for the u-boats, hence reduced losses.
Totally appreciate that not until a significant number of VLRA's become available that the gap gets closed.