Meeting strangers twice, twice

I have two different stories accounting for the same type of coincidence: meeting a stranger twice. 1. One morning I saw a girl who looked like a girl from school. It was not the girl from school, but she looked a lot like her and was wearing a red sweater. Later that afternoon, at a restaurant in a completely different neighborhood of the city, I saw the same girl again, wearing the red sweater. 2. My sister and I were flying from New York to San Jose on a return flight over the weekend. On the Friday flight, bad weather made that there was a very long queue of planes wanting to take off, and our flight was delayed 3 hours on the runway, during which we were stuck in the plane. I did not have a phone with me and asked the lady sitting next to us to please let us use her phone to call our family and let them know we were delayed. She kindly let us do it, and after a long wait we finally made it to San Jose. On the return flight to New York on Sunday evening, the same lady was also a passenger, and she was wearing the exact same clothes as on Friday. She was not sitting next to us, but we briefly exchanged a surprised "We meet again!" when she passed our row. The curious thing is that I am aware that both episodes happened because there were something unusual on both of them, that made me pay attention and record the episode in my mind: a stranger that looks like someone you know, a red sweater; the need to use a phone and talk to a stranger next to you, to whom otherwise, being usually quiet, I would not have talked to or noticed. What if the stranger girl did not look like someone I knew? What if she was not wearing a red sweater? What if our plane had not been delayed? I would have probably not noticed the coincidences. This makes me thing that we actually meet strangers twice more often than we are aware we do. We just don't register these events.