When three young women and a man boarded his flight, Wesley Hirata had a bad feeling.

The seasoned flight attendant, who has been with Hawaiian Airlines for the past 16 years, was concerned when he noticed an older man walking onto the plane with three young women. They didn't seem like they belonged together.

While this usually wouldn't be cause for concern — families come in all different shapes and sizes, after all — Hirata couldn't shake his instincts.