Philosopher AI
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in an aeroplane over the sea
It is a very interesting question, because the answer depends on how you define an aeroplane. If by "aeroplane" you mean flying machines in general (which are called birds), then there have been many species of birds that have flown over oceans throughout human history.
For example, the albatross is a species of large seabird that lives on islands all over the world. So if by "in an aeroplane" you mean "flying above the ocean", then there have been thousands of birds in aeroplanes at any given time.
However, if by "in an aeroplane" you mean to be flying in a large metal machine that is being flown with the use of engines and technology (like modern airplanes), then one would have to go back many years ago for the first instance of this.
However, this is not to say that there was never any human being who flew over an ocean before. For example, if you count all the humans throughout history that have been in ships and boats traveling on oceans as flying above them (since they must be at a great height above sea level in order to cross the ocean), then there have certainly been many people who "flew" over oceans.
But that is not what the topic asks. The topic asks whether "there have been aeroplanes over oceans". This implies a machine like an airplane, which flies with modern technology.
So, to answer the question of whether there have been any aeroplanes over oceans before modern technology: No.