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Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. then why I keep witnessing for example in the Boeing 737-800 PFD (primary flight display, intend to the barber pole) that at low altitude let’s say your stalling speed is around 140CAS when at cruise level stalling speed is way above - approximately 220CAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes?

Thank you all for your answers!

Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. then why I keep witnessing for example in the Boeing 737-800 PFD (primary flight display, intend to the barber pole) that at low altitude let’s say your stalling speed is around 140CAS when at cruise level stalling speed is way above - approximately 220CAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes?

Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. then why I keep witnessing for example in the Boeing 737-800 PFD (primary flight display, intend to the barber pole) that at low altitude let’s say your stalling speed is around 140CAS when at cruise level stalling speed is way above - approximately 220CAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes?

Thank you all for your answers!

2 added 37 characters in body
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Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. sothen why I keep witnessing for example in the Boeing 737 800-800 PFD (primary flight display, intend to the barber pole) that at low altitude let’s say your stalling speed is around 140KIAS and140CAS when at cruise level stalling speed is way above - approximately 220KIAS220CAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes? Sorry for the basic English .

Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. so why I keep witnessing for example in the Boeing 737 800 PFD that at low altitude let’s say your stalling speed is around 140KIAS and at cruise level stalling speed is approximately 220KIAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes? Sorry for the basic English .

Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. then why I keep witnessing for example in the Boeing 737-800 PFD (primary flight display, intend to the barber pole) that at low altitude let’s say your stalling speed is around 140CAS when at cruise level stalling speed is way above - approximately 220CAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes?

    Tweeted twitter.com/StackAviation/status/1142447274607501314
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Why does indicated stall speed change?

Aviation confusing me... I’ve read that stall speed doesn’t change (IAS) no matter what altitude you’re flying - of course under specific conditions ISA, 1G level flight, no wind, gross weight etc. so why I keep witnessing for example in the Boeing 737 800 PFD that at low altitude let’s say your stalling speed is around 140KIAS and at cruise level stalling speed is approximately 220KIAS (random number) Why is that ? Doesn’t stalling speed must to be the same at all altitudes? Sorry for the basic English .