Modern planes have amazing filtration. They HEPA-filter the entire cabin air volume every few minutes. You could not ask for cleaner air in an enclosed environment than a plane.
Primary risks are the people immediately around you - the so called 6ft zone, and surfaces.
The exposure to people in the 6ft zone can be limited by mask wearing (properly fitted). Surfaces just require extra attention (I took disinfecting wipes with us for our international flight) to wipe down surfaces we would touch regularly and hand sanitizer for when we came back to the seat after moving.
Airport choke points, like boarding and security screening, hopefully have been managed on the TSA’s end. They were not managed in late March, but I hope they have put something in place now.
Thank you - I wonder if there are data on cases for pilots and flight attendants, and perhaps ground personnel? I've seen anecdotal references with some numbers but nothing analytical. I was aware of the filtration in the modern planes, and I think they also exchange cabin air with outside are fairly frequently. Older aircraft and the airport choke points you mention are concerning.
Your article on knowing the risks and avoiding them is excellent. I sent it to about a dozen friends and almost all of them sent it to their families. I'm sure most of the families aren't especially analytical, but the report is that they "got it".