Seems that the U.S. Department of Justice is getting serious about the possible anti-trust implications at Washington’s Reagan National Airport of the proposed merger between the two airlines. Reuters is reporting that the DOJ is taking depositions to preserve testimony should it decide to act to prevent the merger.

Reuters is also reporting that 19 state attorneys general have joined in the DOJ probe.

Some of the states involved worry that they will lose a hub because of the planned transaction, which would create the world’s largest airline, while others are concerned about service cutbacks to smaller cities because of the transaction, two sources said.

North Carolina is not among the states that has joined the probe. (South Carolina has joined the probe.)