Table 3.

Airports in the bridge layer.

N0			N1			N2
Airport	Connection	${\mathit{I}}_{\mathit{i}}$	Airport	Connection	${\mathit{I}}_{\mathit{i}}$	Airport	Connection	${\mathit{I}}_{\mathit{i}}$
NKG	95	0.34	SHA	72	0.33	CGO	96	0.25
CSX	91	0.24	HAK	93	0.49	NKG	102	0.27
WUH	81	0.20	KMG	112	0.45	CSX	102	0.26
CGO	95	0.31	CGO	81	0.29	HGH	119	0.45
XMN	93	0.33	URC	76	0.38	HAK	101	0.24
TAO	94	0.21	CSX	81	0.44	SHE	88	0.16
TSN	113	0.36	NKG	79	0.36	SYX	79	0.17
HGH	115	0.41	XMN	87	0.39	KWE	101	0.23
HRB	97	0.25	XIY	135	0.26	WUH	82	0.17
KWE	99	0.27	HGH	100	0.43	URC	85	0.16
SHE	83	0.25	TAO	83	0.48
HAK	102	0.41	KWE	89	0.45
SYX	73	0.18	SHE	79	0.26
			SYX	64	0.21
			CKG	116	0.47
Average	95	0.29	Average	90	0.38	Average	96	0.24