QFE—Transition Height

QNE—Transition Level

QNH—Transition Altitude

RA—Resolution Advisory; Radio Altitude

RAIM—Receiver Autonomous Integrity Monitoring

RAL—Research Applications Laboratory

RCO—Remote Communications Outlet

RJ—Regional Jet

RNAV—Area Navigation

RNP—Required Navigation Performance

RNP AR—Required Navigation Performance Authorization Required

ROC—Required Obstacle Clearance

RSP—Runway Safety Program

RVR—Runway Visual Range

RVSM—Reduced Vertical Separation Minimums

RVV—Runway Visibility Value

RWY—Runway

RWY WP—Runway Waypoint