The Federal Aviation Administration is currently working with airlines to reduce flight schedules at 40 major U.S. airports. This will result in thousands of flight cancellations .

Additionally, airports also announced TSA checkpoint closures . American Airlines has been affected by Philadelphia International Airport's decision to close two checkpoints: one in Terminal A-West and one in Terminal F.

As for Southwest Airlines, the carrier is also forced to make adjustments in light of the latest FAA announcement. We're going to take a closer look at which important Southwest hubs are reducing flights.

We'll also reveal what Southwest Airlines has said about the FAA's decision and how it plans to handle future cancellations as of Friday.

Southwest Airlines' Busiest Airport, Denver Int

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