Dear brother,
Bangladesh is a small country. If u put a squadron at FOB Cox's bazar, Two at Dhaka and half at Bogra, that covers all the possible air routes. That's like 3.5 squadrons. One attack squadron is required at Chittagong as well. Total is like 56 multirole aircraft and 16 attack aircraft.
You do not need lot many aircraft to be in dominant position. You need some very good aircraft with twice the number of extremely well trained combat ready pilots for those aircraft. 48 to 72 multirole fighter aircraft is good enough for BAF.
However, BAF plans to acquire a total of 9 squadron of planes including a sq. of training/fighter planes in its arsenal. That makes about 144 planes in total.