The main museum in Valletta has some aviation relics; you might try there.
Essentially there are only 2 airfields still identifiable as such: Luqa (the main airport) and Hal Far, which is built on although satellite photos show what looks like a dragstrip on the old main runway. Ta Qali has also been built on and houses the main football (soccer type) stadium.
There was another airfield at Safi, between Luqa and Hal Far but this was swallowed up when they extended the main runway of Luqa. Qrendi, west along the south coast from Hal Far is barely recognisable although a public road now runs along what was one of the runways.
During the war, the racecourse just north of Luqa was also used to 'disperse' aircraft although, unlike Safi and Hal Far it was not connected with Luqa by a taxiway.