I mean by fellow passengers/individuals not the aircrew. Like if the person sitting next to you offers to sell you something.

closed as off-topic by JonathanReez, Calchas, CGCampbell, iHaveacomputer, Itai Aug 28 '15 at 4:26

  • This question does not appear to be about traveling within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

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    Did you try to sell your gold bar in the plane? – iHaveacomputer Aug 28 '15 at 0:04
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    Hypothetical question, voting to close. – JonathanReez Aug 28 '15 at 0:32
  • This would be part of the shadow economy. There is a great Freakonomics podcast from 3 years ago this week which covers this topic indepth. – Mark Mayo Aug 28 '15 at 0:59
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    I'm voting to close this question as off-topic because it is not a question about travel but a question about laws – Calchas Aug 28 '15 at 2:03
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    Boeing officially sells their aircraft in flight. As in, the handover of the paperwork is usually done on board the aircraft during its delivery flight... – jwenting Aug 28 '15 at 6:04

There are no such restrictions on flights.

However, for your own safety; you should be careful and apply your normal common-sense checks, just like you would in any other transaction.

There are no specific protections provided to you, just because you are on a flight.

You would still be liable for the sale (for example, if the item is subject to customs you would be liable for that; similar to taxes, etc.).

Especially be cautious purchasing electronic items which may be [a] counterfeit [b] stolen [c] infested with malware.

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