https://www.bbc.com/news/business-52822913
But virologist Dr Tang disagrees: "The problem is that if you're sitting next to somebody - 0.6 metres in economy, say - who's coughing and sneezing in that immediate area, that aerosol will reach you before it has time to reach the filtration system, get filtered and come back down again."
Profitable and going to very much more so.