I don't think it matters how big the global pilot pool is for 737s. What matters to a specific airline is how many of their pilots are type rated for a particul

I don't think it matters how big the global pilot pool is for 737s. What matters to a specific airline is how many of their pilots are type rated for a particular aircraft. An airline that has standardized on the 737 is going to have a pool made up of mostly 737 rated pilots.