(CNN) Travelers flying out of Phoenix Thursday are no doubt safely at their destinations by now.

For their luggage -- much different story.

After a screening glitch that lasted hours Thursday, travelers by the hundreds were left wondering when their belongings would show up.

Thousands of checked bags piled up at Sky Harbor Airport in Phoenix after technical issues with computer servers prevented the Transportation Security Administration from using machines to screen the luggage.

As a result, more than 3,000 bags missed flights, said spokesman Nico Melendez of the TSA.

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