SEATAC, Wash. United Airlines passengers were caught by surprise Wednesday morning.

The third largest airline carrier, United Airlines, moved from the north end of theSea-Tac Airport terminal to the far south end after 40 years in the same spot.

Nancy Peterson, a United Airlines passenger, was one of those who was a little caught off guard.

The move happened overnight when signs were changed at ticket counters and baggage claim. United planes are now at Concourse A.

United s move, which is one of the last pieces of the major realignment of airlines at Sea-Tac, will give the airport s largest carrier, Alaska Airlines, sole control of the north portion of the airport.

Delta Airlines is also making changes. It has plans to unveil a new flow-through ticket counter Thursday morning.

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