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Free airport WiFi is nearly universal now among major hubs, but lounge quality and amenities still vary wildly — some airports (Singapore Changi, Seoul Incheon, Doha) have turned the terminal itself into a destination, while others are fine for a quick connection but not worth lingering in.
If you've got a few hours to kill, check whether a day-pass lounge is worth it here, and look for the one standout amenity — it's often the difference between a forgettable layover and a genuinely good one.