I keep meaning to ask someone. Almost always when I fly, which I have done a lot over the years and happened on my flight from CHCH last night, the plane feel like it surges forward for a few seconds, and the engines make a lot of noise. Mid flight or sometimes right before they are landing, on final approach. Doesn't seem long enough to make a material difference to not being fast enough for approach etc.
Was wondering if anyone else noticed and knows why?