Last year was Denver International Airport's busiest on record. "We will end 2023 much higher than our forecast at about 78 million passengers annually," said Phil Washington, CEO of the Denver International Airport. OAG, a global travel data provider, said Denver went from the 21st busiest airport in the world in 2019 to the sixth in 2023. Forty percent of our customers are local Denver, and it's a fast growing city," said Jonna McGrath, vice president of Denver Airport operations for United Airlines. CNBC got a behind-the-scenes look at United's Denver operations and explored how the airport and the airline plan to keep up with demand.

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Persons: Phil Washington, Denver, Jonna McGrath Organizations: Denver International, United Airlines, Southwest, Frontier Airlines, DIA, Denver, CNBC Locations: Colorado, Denver