ΔP -- Delta pressure
A/I -- Anti-ice
ADC -- Air data computer
ADS-B -- Automatic dependent surveillance (broadcast)
AFCS -- Automatic flight control system
AFM -- Airplane Flight Manual
AGB -- Accessory gearbox
AHRS -- Attitude and heading reference system
ALT -- Altitude
AOA -- Angle of attack
AP -- Autopilot
ARINC -- Aeronautical Radio Incorporated
ASCU -- Antiskid Control Unit
ATC -- Air traffic control
ATIS -- Automatic terminal information system
AVN -- Avionic
B -- Both (pilots flying)
BIT -- Built-in test
BRG -- Bearing
BVA -- Bleed valve actuator
CAS -- Crew alerting system
CB -- Circuit breaker
CDI -- Course-deviation indicator
CG -- Center of gravity
COM -- Communication
CRM -- Crew resource management
CWS -- Control wheel steering
Delta-P -- Delta pressure (also see ÄP)
DEST ELEV -- Destination elevation