Air Malta
You may be correct to the Air Malta flights being operated onbehalf of Airtours!
Thomson Holidays used Air Europa, Air Malta, Britannia (Thomson) and Sata for there IT flights and First Choice and Airtours generally used Air Malta, Iberoworld and Spanair.
During the 1998/2001 period there were IT flights to Alicante, Faro, Ibiza, Mahon, Malaga, Malta, Palma, Tenerife.