Forecasters predict a 90% chance of good weather for liftoff of a United Launch Alliance Atlas 5 rocket from Cape Canaveral just after sunset Tuesday with a classified payload for the National Reconnaissance Office, the U.S. government’s spy satellite agency.

The Ariane 5 rocket’s fifth flight of the year launched at 2030 GMT (4:30 p.m. EDT) with the Sky Muster and Arsat 2 communications satellites, designed to deliver broadband Internet to far-flung Australian citizens and broadcast television and networking services to Argentina and nearby countries.

Air Force meteorologists are giving good odds of acceptable weather conditions for the United Launch Alliance Atlas 5 rocket to fly Friday morning from Cape Canaveral to put a Navy mobile communications satellite into orbit.