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Ok thanks for that clarification JB. So I'm assuming that as weight reduces and you remain at fixed altitude, the reason you need to reduce speed is to save fuel? I am also assuming that when deciding to climb higher(with the aim of returning to target speed) that speed would need to be...

JB thanks for the response. Why wouldn't higher altitude mean faster ground speed?

Hi All, Recent PER to LHR round trip in 787-9 upon descent the behaviour I noticed(in lay person terms) was engine noise would increase followed by drops in altitude.This would be repeated about 3 - 4 times before final approach. I do know that the 787 flies at a higher altitude(40k ft) so...