When I get on a plane I will nod and smile, if someone nods and smiles at me. I’m usually all business. I get to my row, stow my bag, sit down — and work until boarding finishes.
I’m a “speak only if spoke to” kind of guy on a plane. I’ll never strike up a conversation unless I see someone in distress (“can I help you put your bag in the overhead?” “I overheard you’re worried about your connection…”).
But we’re all trapped together in a metal tube.