Frankfurt (FRA): free WiFi, excellent lounges.
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Yes. Free WiFi is unlimited, but Frankfurt is large enough to require real walking time between some gates.
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.
An extensive Lufthansa lounge network and a shopping-mall feel throughout the terminals.
Yes — Frankfurt (FRA) is one of the better airports in the world to have a long layover in, with plenty to see and do.