WASHINGTON — A congressional panel grilled members of the Metropolitan Washington Airports Authority board Friday morning in a hearing called to examine a scathing report on the bond-issuing agency’s ethical practices and policies.

The MWAA representatives present before the House Committee on Transportation and Infrastructure, including board Chairman Michael Curto and Vice Chairman Tom Davis, a former congressman whose district included the authority, mostly accepted responsibility but also defended some past missteps. They said they had already made most of the reforms needed to alleviate concern.

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