Maintenance on an air conditioning unit inside Terminal 4 at Phoenix Sky Harbor International Airport on Wednesday morning resulted in long wait times at security checkpoints for travelers.

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An air conditioning unit in Terminal 4 of the Phoenix Sky Harbor Airport was deactivated for routine maintenance and stayed off longer than expected.

An air conditioning unit in Terminal 4 of the Phoenix Sky Harbor Airport was deactivated for routine maintenance and stayed off longer than expected.

An air conditioning unit in Terminal 4 of the Phoenix Sky Harbor Airport was deactivated for routine maintenance and stayed off longer than expected.

An air conditioning unit in Terminal 4 of the Phoenix Sky Harbor Airport was deactivated for routine maintenance and stayed off longer than expected.