Southwest Airlines celebrated a big milestone on Wednesday.

The airline flew its first "unmanned" flight on a Boeing 737 MAX 8 from St. Louis, Missouri to San Francisco. Now, before you think, "Why wasn't anyone flying the plane?" That's not quite what they were aiming for.

The flight was, instead, Southwest's first time having an all-woman crew, including the two pilots.

Like many things these days, the company celebrated the milestone on social media, tweeting out photos of the crew.

The airline also took a few moments to shut down haters who thought it wasn't a big deal.

One twitter user tweeted (and since deleted): "If this was an all male crew I don't think y'all would be celebrating this event."

The airlines response?