PN
English is an official language of Malta and is also widely spoken.
However, it is not classed as the national language of the Maltese islands, which has been Malti since the middle 1930s and before that Italian.
So an interesting anomaly in that an airline chooses a language which is not the main spoken tongue of it's country.
At a practical level, I agree most Maltese are at least fluent in English and some groups, such as the 'Tal Pepe' speak English as a preference.