Noticed it today, rather than a gradual build up of noise you just suddenly hear an airplane like it appeared out of nowhere?
In: Physics
Answer: you may be hearing a common commercial plane, the Airbus A220, which makes the famous “Whale Noise” when on approach to an airport.
When the 220s turbofan engines reach a certain RPM, it makes a sudden noise change which we hear as a whale howling.
So in addition to the other answers, you may also be in the right flight path for an airline that flies the A220 like Delta. Something like a 747 won’t have that distinct transition.
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