Format: [CALLSIGN] [h HDG] [a ALT] [s SPD] [r RWY] [ca]
Examples:
• UAL123 h 090 a 050 s 180 r 09L ca
• AAL456 r 27R ca (assign runway and clear approach)
• DAL789 ca (clear approach if runway already assigned)
ALT in hundreds: 050=5000ft, 030=3000ft, 012=1200ft
Commands: ca|approach|ils = Clear for Approach