Boingo Global WiFi Terms & Conditions:

To connect successfully to a Wi-Fi hotspot, users must be within range of a hotspot within Boingo’s network
Physical obstructions, such as brick walls, metal frames or concrete may reduce the range of a hotspot.
Boingo provides in-flight WiFi access on select flights. Availability varies by aircraft, schedule and other factors determined by the airline and is subject to change at any time.

Visit here for more details on Boingo WiFi

Click here to view eUsage guide

Click here PDF attachment of MITC 1.41