No Internet Connection Message

iPhone

When your iPhone is in Airplane mode and the WiFi network is connected to the airplane (PowerUp-XXXXXX) you do not have access to the internet.
If you wish to have internet access at the same time, disable Airplane mode, turn on WiFi and turn off Bluetooth. This way you can use the internet through your mobile network (cellular network).

Android

When your Android phone is connected to the airplane's WiFi network (PowerUp-XXXXXX) you do not have access to the internet.

Different devices display different messages to indicate that your connection to the internet through WiFi is disabled, for example: "No Internet Connection"; "Cannot connect to WiFi" etc, and some devices do not show any message. Android phone's do not enable access to the internet through your mobile network (cellular network), while the WiFi network is busy.

Android Internet Connection Confirmation