Doha (DOH): free WiFi, excellent lounges.
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Yes. Free WiFi is unlimited across the airport.
Lounge quality here is excellent. A day pass, often purchasable without status or a premium ticket, can be well worth it for a longer layover.
Qatar Airways' Al Mourjan lounge includes a full spa and pool — one of the most talked-about lounges anywhere.
Yes — Doha (DOH) is one of the better airports in the world to have a long layover in, with plenty to see and do.