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I don’t know about GS8+ but older devices don’t let you turn Bluetooth on while in airplane mode.

I used to have an S2, S3, S4 and S6 before my S9 and (as far as I can recall) it's always been possible to turn Bluetooth on while in airplane mode.

Older device: 2013 Moto X, Android 5.1. Lets you turn on WiFi, Bluetooth, whatever, with airplane mode on.