During the Falklands campaign I flew a charter in a B737 to, I think, Alicante and was parked near an Argentinian B747 alongside which were several large wooden crates, the type machinery is usually shipped in.
'phoned the MOD when I got home who took all the details an expressed gratitude etc. last I heard. I'm sure the Spanish did offer support to Argentina and the ground staff were quite unfriendly at some Spanish airfields during the war and for a while afterwards.