Delta Air Lines Airbus A321 and Boeing 737 jets parked at its LaGuardia Airport hub.
Thomas Pallini/Insider
- Delta's CEO questioned the financial viability of airlines struggling despite healthy travel demand.
- Airlines desperate to generate revenue have flooded the market with cheap flights in recent months.
- United's CEO had similar words for low-cost carriers in June.
Delta Air Lines CEO Ed Bastian had stark words for competing airlines that depend on selling low-priced tickets to stay alive.