Another example that comes to my mind is a highly skilled expert in repairing some important machinery, e.g. ship engines or factory lines.
Who said anything about 3-4 times a week? There are plenty of businesses with high earners where time matters and I could see flights like these being profitable. Boards meet quarterly typically and they are often preferred to have in person.
What kind of multi million dollar deal blows up because a dude arrives 18 hours later? And what are they doing when they get there that couldn’t have been done online?
In business face time still matters. Less than prior to COVID but it still matters. Most boards prefer to meet in person.