HIRL: High-Intensity Runway Lights.
HMA: Hot Mix Asphalt.
IFR: Instrument flight Rules.
ILS: Instrument Landing System.
i: growth rate.
Kn: knot, a unit of speed.
MI: Mix Index.
MGW: Main Gear Width.
Max: Maximum.
Min: Minimum.
No.: Number.
n: number of years.
O&D Airport: Origin and Destination Airport.
OFAS: Object Free Areas.
PAPI: Precision Approach Path Indicator.
PAR: Precision Approach Radar.
PCC: Portland Cement Concrete.
PHV: Peak Hour Volume.
P.M.V: Peak Month Volume.
p: current passengers.