United Airlines

Service will start this spring.

The carrier cited strong premium earnings, a rebound in business travel, and increased loyalty activity.

The airline is looking to maximize capacity amid constraints from air traffic control and a scarcity of available airport gates.

New daily year-round markets and seasonal summer service announced from multiple hubs.

The carrier is moving to preorder-only for United Economy food options.

The carrier will resume service there in May.

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The aircraft landed safely and no injuries were reported.

The special trips, all staffed by United volunteers, run through Dec. 19.

Republic and Mesa formally merged as Republic Airways Holdings in November.