Sierra Shields, 30, was last seen Thursday (January 14) at noon at LaGuardia Airport, where she worked.
Shields' father, Chris Shields, told Eyewitness News that his daughter showed signs of distress that were "out of character" when talking with family members the previous week.
A co-worker, who was last to see Shields, said Shields turned in her flight attendant equipment before she disappeared.
The NYPD gave out this description of Shields:
- 5-feet, 7 inches tall
- 160 pounds
- black hair
- brown eyes
- medium build
- medium complexion
- wearing navy blue dress
Shields lives on 35th Street between Ditmars Boulevard and 21st Avenue in Astoria.
Family and friends posted yellow posters around Queens over the weekend, trying to locate Shields.
They've also set up a Facebook group, and are using the hashtag #FindSierraNYC on social media.
Anyone with information is asked to contact the NYPD at 800-577-TIPS.