In his first comments on a CBS News Colorado investigation that found Denver International Airport executives paying between $12,000 and $19,000 to fly to a conference in Spain, Denver Mayor Mike Johnston said, "I have not ever paid that much for an airplane ticket.

"I would not have the capacity to do that, no," he said.

The mayor made the comments during a wide-ranging interview with CBS News Colorado on Monday. After learning of the high dollar tickets, he said: "I share the same concerns. That's a very big number and that's not the way most Denverites would expect to travel."

The CBS Colorado broadcast report in May found nine top executives at the airport, including airport CEO Phil Washington , flew to a three-day aviation conference in Madrid in April, flying first or

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