Scott Kirby on stage in front of United logo.
Scott Kirby took a jab at ultra-low-cost carriers during an interview with The Air Show podcast on Monday.
  • United Airlines CEO Scott Kirby said ULCCs are "going out of business."
  • Kirby criticized no-frills carriers like Spirit for prioritizing cheap costs over customer service.
  • He poked fun at one ULCC for charging $99 for a carry-on and then giving the agent a commission.

Ultra-low-cost airlines are taking one out of left field.