FRatSTN
Your excellent post came across as something that I could have posted because I certainly agree with everything that you have stated.
I totally agree with you regarding Biman Bengladesh and a possible move to STN. I also think that if and when Pakistan International recommence flights to London that the possibility of them resuming STN as their London gateway is very high indeed.
So in saying that and between us we could possibly see the following International flag carriers serving STN at some point in the future.
Biman Bangladesh...Dhaka, Sylhet
Juneyeo Airlines...Shanghai
Pakistan International...Islamabad, Karachi, Lahore
Qatar...Doha
Turkish Airlines...Istanbul
And a real long shot but a possibility especially after remarks made by the airline's CEO in regards to their incoming fleet of A321XLRs.
Frontier Airlines...Philadelphia
Along with the existing International airline's.
Emirates...Dubai
Royal Jordanian Airlines...Amman
That could possibly be eight International airline's serving STN within the next few years.
Two other possible airline's but not as strong contenders as the six that I have listed above are.
Flynas...Damman, Jeddah
Jazeera Airways...Kuwait
And to finish I'd just like to add....I wonder which London airport Indigo will actually serve once they receive their A350s 🤔