Table 1.

Level of Service (LOS) as transcribed by IATA in the form of a quality of service scale.

Level	Level of Service	Flow	Delay	Confort
A	Excellent	Free	None	Excellent
B	High	Stable	Very Few	High
C	Good	Stable	Acceptable	Good
D	Adequate	Unstable	Passable	Adequate
E	Inadequate	Unstable	Unacceptable	Inadequate