a Delta Air Lines memo to prospective employees leaked online, identifying the kinds of things that they want to see (and don't want to see) in interviews.

The memo is entitled "Appearance Requirements Acknowledgment," and it spells out very simple and specific things during the interview process that could give applicants an advantage, or else serve as red flags.

Avoiding all profanity and gum-chewing at any time during the interview assessment day. 

Having fingernails that are "clean, neat, and trimmed." Nail polish, if used, has to be all one color with no neon shades, adornments, or glitter. 

Wearing interview outfits that look "professional and fit properly," including not wearing skirts that are too short. 

Hair has to be "natural-looking hue." 

No more than one single-side nose piercing or two piercings per ear, and no hoop earrings or ear stretchers. 

Visible tattoos are also banned, although they are allowed if they can be covered with makeup or are not visible while wearing a uniform.

Wearing "proper undergarments" that should not be visible to anyone else.

https://www.inc.com/bill-murphy-jr/delta-air-lines-just-had-its-hiring-memo-leak-contents-are-eye-opening.html