Northrop Grumman Corporation’s U.K.-based air traffic management (ATM) subsidiary, Park Air Systems, has been awarded a contract by NAVIAIR, the Danish air navigation service provider, to replace the existing ground-to-air communication equipment for Denmark’s airports and en-route operations. The replacement will introduce the new Park Air T6 radio from the Sapphire range, with 8.33 kHz voice channel spacing and VoIP …