You can fly a category of airplanes called ultra-light and you don't need a pilot's license. You can take a single passenger. It is based on airplane weight and horse power. Different countries have different standards.
https://en.wikipedia.org/wiki/Ultralight_aviation
As a student pilot in the US you can fly without a passenger but also with other restrictions like your flight instructor has to give you an endorsement to fly and most won't give you an unrestricted endorsement. It is really there to get you a certificate and not as a way to bypass it. All other require a certificate (technically it is not a license but rather a pilot certificate).
https://en.wikipedia.org/wiki/Pilot_certification_in_the_Uni...
No, ultralights are single seat to protect members of the public:
"For example, the assumption can be made that a person who elects, without pilot qualifications, to operate an uncertificated vehicle alone is fully aware of the risks involved. This assumption does not hold true of a passenger selected randomly from the general public. Persons in the general public will likely assume that the operator has certificated pilot qualifications."
Also, not all airports allow ultralight operations.
To HN readers in general, here is how to understand how the FAA thinks, and why they will never deviate:
1) Passengers are assumed, correctly, that they cannot evaluate the risks of a flight, and FAA regulations must protect them.
That's why you won't see passenger drone flights in this century in the US, or any advertised "ride sharing" between strangers.
(The FAA has been slow on banning helicopter skid pop-out floats for sightseeing flights, but I predict that will change.)
2) That VFR and IFR flights must be physically separated.
That's why everything that moves will be required to have ADS-B out.
If you're involved in any kind of business model that opposes the above, it is only a matter of time until the FAA stops you. You're welcome to use the words "doctrine" or "never" when explaining the above.
As a student pilot in the US you can fly without a passenger but also with other restrictions like your flight instructor has to give you an endorsement to fly and most won't give you an unrestricted endorsement. It is really there to get you a certificate and not as a way to bypass it. All other require a certificate (technically it is not a license but rather a pilot certificate). https://en.wikipedia.org/wiki/Pilot_certification_in_the_Uni...