Denver's independent Board of Ethics is investigating the purchase of business and first-class tickets this past April for nine Denver International Airport executives to fly to a conference in Madrid, according to three sources aware of the ongoing investigation.

The probe was sparked by a CBS News Colorado investigation in May that revealed the airport spent as much as $19,000 for one of its executives to fly to the three-day conference. Another ticket cost about $16,000.

All of the executives flew either business class or first class to the conference and back to Denver. "Our policy allows us to do that," said Denver International Airport CEO Phil Washington.

Denver International Airport CEO Phil Washington provides speaks at a news conference on Tuesday, Feb. 18, 2025. CBS

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