Flight is a synonym of pair.
In cricket|lang=en terms the difference between flight and pair
is that
flight is (cricket) the movement of a spinning ball through the air - concerns its speed, trajectory and drift while
pair is (cricket) a score of zero runs (a duck) in both innings of a two-innings match.
In obsolete|lang=en terms the difference between flight and pair
is that
flight is (obsolete) fast, swift while
pair is (obsolete) to impair.
As nouns the difference between flight and pair
is that
flight is the act of flying or
flight can be the act of fleeing while
pair is two similar or identical things taken together; often followed by of.
As verbs the difference between flight and pair
is that
flight is (cricket|of a spin bowler) to throw the ball in such a way that it has more airtime and more spin than usual while
pair is to group into sets of two or
pair can be (obsolete) to impair.
As an adjective flight
is (obsolete) fast, swift.