US authorities halted flights nationwide due to communication issues affecting air traffic control, an extraordinary action that threatens to disrupt travel across the globe. The Federal Aviation Administration said in an advisory notice on its website on Friday that the ground stop affects all US airports and departing flights should remain grounded until further notice. It cited “extraordinary circumstances” and “reasons of safety.” Bloomberg Intelligence Global Head Aerospace, Defense & Airline Analysis reacts to the ongoing situation saying the ground stop is about de-conflicting traffic. (Source: Bloomberg)