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Re:In Europe, Trains Are Full, and More Are on the Way by testrun on Saturday January 06, 2024 @12:31PM (#38893313)
Not taxed does not mean it is subsidized. Subsidy is when money is paid by the government to the airlines.
Re:In Europe, Trains Are Full, and More Are on the Way by somewhereoutth on Saturday January 06, 2024 @07:55PM (#38897228)
Tax on fuel reflects the externalities to the whole of society, and arguably it is not high enough.

So exempting tax (equivalently not charging for externalities) is indeed a subsidy, a transfer of wealth from government (and so society) to the airline operators.