Lindsay Gottlieb, a basketball coach for the University of California, Berkeley tweeted about her experience after a ticket agent asked for ID because Gottlieb's last name didn't match her son Jordan's, reports Yahoo.
Gottlieb said she was flying home from Denver when a Southwest agent asked her to prove she was the mother of her baby.
On Monday night, coach Lindsay Gottlieb tweeted about the incident, stating that the agent at Southwest's ticket counter told her that she needed to "prove" that her son, Jordan Peter Martin, was hers, even though Gottlieb had his passport.
Gottlieb told KPIX she doesn't hold the entire airline accountable for the actions of one employee, but that she felt the need to say something on behalf of her son.
The airline apologized in statement reported by the CBS affiliate, saying it would be launching an investigation into the incident.
Gottlieb was flying from Denver to Oakland over the Memorial Day holiday, along with her husband and their son.
Southwest has since reached out to Gottlieb to "address her concerns", according to a statement shared with Fox News.
Gottlieb is white and her fiance Patrick Martin is African-American.
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"We had a passport that verified our son's age and identity, and both parents were present", she said.
But at least one person pointed out the double standard - if the Southwest employees weren't routinely making all mothers with different last names prove their relationship to their children, then they certainly shouldn't single out mixed race babies.
Gottlieb said the incident made her aware that the sort of questioning she experienced was probably common among nonwhite families. Would have missed flight if it was not delayed. Southwest replied quickly - apologized and said they would make this a "coaching" moment for their organization.
We apologized for the interaction that left this family feeling uncomfortable-which would never be our intention.
A review of the airline's age policies shows that proof of a child's age, in the form of a birth certificate, is required if children are younger than 2 and want to fly for free by sitting on their parents' lap.
"She 1st asked for proof with birth certificate".
"Once I learned it's a precaution for the very real threat of child trafficking, I stopped being exasperated with it. Southwest Employees are well-regarded for their Hospitality, and strive for the best experience for everyone who entrusts us with their travel".