Seems a tad generous considering a back-of-the-envelope calculation puts the average amount contributed to GDP per US citizen per hour at around $6.

From an airline point of view, if their schedule is sufficiently flexible to accommodate the delays without flight cancellations and the delays are insufficiently long to require passengers to be compensated, the biggest costs will be additional fuel if the delays involve the aircraft being put in a holding pattern at the other end and additional time or penalty charges levied by the airports. Staffing isn't that big a deal even if they're on overtime.

Though if you’re travelling for business - you’re probably not doing "normal" work. Travelling to sign big deals, and so on. Even a few large deals would skew that number upwards.

The DOT numbers are based on median hourly income of airline travelers, rather than their contribution to the economy. You can read the report I linked for their detailed methods.