Ask HN: Why were names of other passengers appearing in my flight details?

I am assuming that Google can usually provide live flight information by being able to read my flight tickets being sent to my Gmail. However, when I searched my flight number in Google, I could see the names of two other passengers. I have never met these people and their emails are not in my Gmail. Is this supposed to happen?

http://imgur.com/yb8c9Ks