With helicopters it's more that they're expensive than unsave.
Airliners should be below boats for convenience 😂 just because of airport security and bag collection...
Airplane least convenient for travel from bedroom to kitchen
Walking least convenient for travel to Antarctica
Oh, and because you have to get to the airport first with some other means of travel and then get to the terminal...
why are scooters practical and motorcycles not? I only ride a motorcycle. any distance too long for bycicle or inconvenient with public transit, I take my motorcycle.
Looks like only because they're presented as dangerous. Convenience - wise they're still the same. Practicality seems to be defined here as a balance between danger and convenience.
Now I wish I has a hot air balloon for my transportation optimization algorithm.
xkcd
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