United Airlines temporarily grounded its fleet of 96 Boeing 757s on Tuesday for emergency checks on air data computer systems, but said the fleet was nearly back to normal by Wednesday afternoon. The carrier said 15 flights were canceled on Tuesday owing to the checks but none on Wednesday. The checks were spurred by an internal discovery that UA hadn't conducted all of the operational checks on the equipment mandated by a 2004 FAA Airworthiness Directive. The checks took about 60-90 ...

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