There was a famous case in 2017 where a surgeon was violently removed from an overbooked United Express airliner. He had refused to leave voluntarily, as doing so would have meant not seeing his patients the next day. [0] I'm not sure this strictly counts as travelling for work, but the points remains.
Plenty of people fly abroad for medical care. [1]
Over 2,000 flights were cancelled in this incident. Over 300,000 would-be passengers were affected. [2] It's implausible that nobody's medical care was affected.
[0] https://en.wikipedia.org/wiki/2017_United_Express_passenger_...
[1] https://en.wikipedia.org/wiki/Medical_tourism
[2] https://aerospaceglobalnews.com/news/uk-airport-disruption-f...
It could have happened if it was uncommon and it could have happened if it is common.
My claims:
1) most flight's are not necessary
2) it's not common to fly for medical care (yes, very rich people may have a different perception, but that's all it is)
You said the flight doesn't contribute to preventing harm to anyone. Interfering with medical care is a clear form of harm, that's why I focused on it.
> it's not common to fly for medical care (yes, very rich people may have a different perception, but that's all it is)
That's incorrect on both counts: it's common, and it's not just rich patients. Please take a look at the Medical tourism Wikipedia article I linked above. Cost-reduction is a major motivation of medical tourism.
From [0] :
> in 2016 nearly 144,000 UK citizens travelled abroad for medical treatment. The survey suggests a steady increase since 2000, even though the 2016 sample of 250,000 travellers represent 0.23% of the total number of travellers entering or leaving the UK.
See also [1].
[0] https://doi.org/10.58248/PB38 Outward medical tourism (2020)
[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC3812100/ Medical Tourism: A Cost or Benefit to the NHS? (2013)
Likewise because it's big and a lot of it is empty the US does more medical flights than a country like the UK, if a Wyoming multi-millionaire needs urgent treatment in a Californian hospital you're not going to load him into a truck and drive there, you use a plane. This is relatively high risk commercial air travel, it's not quite as dangerous as most GA but there's some get-there-itis because you don't want to abort the flight and let down your patient, and you're often flying one-off journeys whereas the people doing scheduled passenger travel it's like a bus, same route, every time, regular as clockwork, and if things go wrong you just scratch the flight and no harm, no foul.