It's unlikely business travel will ever be the same; environmental pressures aren't going to go away, neither are pressures to cut costs, in fact the latter will likely be the greater driver of the two, and businesses have discovered through home working that many meetings can be done without physical face to face contact. Of course there will still be the need for business travel, but so many meetings can be adequately completed online through Teams, Zoom etc. When I say adequately, I mean that in an ideal world there is no substitute for face to face, and I dislike Teams meetings intensely, but you can't take away from the fact that each one is achieved at lower financial cost, lower cost in time, and low environmental cost.