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Although it's acceptable to use prepositions at the end of the sentence, it's not favorable to grammarians or grammar teachers.

How else could I rephrase the question:

Which license are airplan models licensed under?

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closed as not a real question by MετάEd, RegDwigнt Jun 6 '13 at 13:53

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Writing advice requests are off topic. Please see the FAQ. Thanks. – MετάEd Jun 6 '13 at 12:12
The "rule" about not ending sentences with prepositions is more of a guideline really. There is absolutely nothing wrong with "Which license are airplane models licensed under?". – terdon Jun 6 '13 at 12:22
The "rule" is not even a "guideline". It is completely and utterly bogus. This site is not meant for rephrasing perfectly grammatical English to satisfy random nonsensical constraints. The answer to your question, "How should I avoid this?", is "You should not avoid this" — as is well documented on this very site, on Wikipedia, on Language Log, and in countless other places. – RegDwigнt Jun 6 '13 at 14:01

Under which license are airplane models licensed?

But it would be better style if you can avoid the double use of license.

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Since the licence gives the right to do "something", that is what should be placed in the second position. Does it give the right to manufacture, to sell, or to export? – Fortiter Jun 6 '13 at 12:19

Or, to avoid the recommended double use of 'licence':

Which licence do I require for an airplane model?
Which licence do I require to do ... with an airplane model?

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