1) Big blue 2) Cloudless expanse
Found on
https://www.crosswordclues.com/clue/opensky
OpenSky is a registered trademark of Harris Corporation and is the trade name for a wireless communication system, invented by M/A-COM Inc., that is now a division of Harris RF Communications. OpenSky technology applies voice over IP transport to radio communications applications in a unique architecture. In the mid 1990s Federal Express invited p...
Found on
http://en.wikipedia.org/wiki/OpenSky
No exact match found.
