WASHINGTON — The Metropolitan Washington Airports Authority’s outlook was revised to negative by Moody’s Investors Service on Wednesday, ahead of a $350 million revenue bond transaction it has scheduled for later this month.

The outlook was revised to negative from stable based on the expectation of “significantly higher” costs per enplaned passenger and lower debt-service coverage, Moody’s analysts said in a report. Moody’s affirmed its Aa3 rating on the authority’s outstanding airport bonds.

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