How to pronounce“727”in English

which was called the 367-80 and at that time we were putting a pratton Whitney engine on the side of it which was known as thejt8d uh and was going to be the engine for the 727 which at that time was on the drawing board and so we did flight test to see how that would work astrapped on the side of a 707 and that was the first job I had I actually went to Boeing um great fear that I was assigned to a drawing board and to do