Originally Posted by
MSPeconomist
Is it possible that the PP fare being considered is dual inventory and requires also a certain coach fare class in which only one seat is available, but due to an IT mistake, the "three available" means three in the PP fare class without a check of coach fare class availability? I started to call this an IT glitch but it's more of a misunderstanding of the logic behind fare class availability.
This is indeed how "x seats available" works, but without cities I can't give a specific example.