Meeting on a plane

I was due to fly from Los Angeles to UK but the flight was cancelled and I was rerouted on a flight via Chicago, where I'd have to have a stop-over. After take-off, someone asked if I would change seats so they could sit with a partner, and I moved to an aisle seat. I looked across the aisle, and saw a man reading a chapter in a book I knew on a very specialised academic topic that I have published on. There's probably about ten people in the world really interested in this stuff. Emboldened by free alcohol I introduced myself (can't remember how!). He turned out to be someone I'd corresponded with but never met, based in Chicago. It would have been a coincidence anyhow, but seemed all the more amazing since I shouldn't have been on that plane, and should have been in another seat. He was great : we spent hours talking, and he and his wife ended up putting me up overnight.