The reason that the 5GHz WiFi band is disabled during flight (airplane) mode is comply with local regulations. There are regions in the world where the usage of the 5GHz band is not allowed to be used for WiFi transmissions. As the Lumia WP8 phones are unable to determine the location whilst in flight mode, the phones disable the usage of the 5GHz WiFi band in order to comply with regulations.
- Are there limitations for Hey Cortana on my Lumia?
- What to check if I can't sign in or create the Microsoft account on my Lumia phone during the initial setup?
- How can I train Hey Cortana on my Lumia phone?
- How does Hey Cortana work when Battery Saver mode is on?
- Will I get “Hey Cortana” voice activation after Lumia Denim update?