Table 4 The cross-validation results using the feature set with the lowest error rate for the main dataset

 AKL

11

1

1

1

 BER

19

1

 BOG

14

1

 HAM

14

 HGK

15

 ILR

1

23

1

1

 LON

18

1

2

2

 MAR

9

 NYC

1

25

1

1

1

1

 OFA

18

 PXO

1

16

1

 SAC

1

18

 SAO

1

1

1

1

1

18

2

 SOF

7

 STO

1

1

1

1

16

1

 TOK

1

1

1

23

 Error rate (%)

21.43

9.52

6.67

12.50

6.25

4.17

18.18

10.00

3.85

10.00

20.00

0.00

25.00

30.00

15.79

8.00

 AKL

11

1

1

1

1

 BER

17

1

2

1

1

 BOG

14

 HAM

1

13

 HGK

16

 ILR

1

23

1

 LON

22

1

2

2

 MAR

8

 NYC

1

25

1

1

 OFA

19

1

 PXO

1

1

16

1

 SAC

17

 SAO

1

1

1

19

4

 SOF

1

5

 STO

1

1

1

16

 TOK

1

1

24

 Error rate (%)

21.43

19.05

6.67

18.75

0.00

4.17

0.00

20.00

3.85

5.00

20.00

5.56

20.83

50.00

15.79

4.00

 AKL

9

1

1

 BER

19

1

1

1

1

 BOG

13

 HAM

13

 HGK

1

16

1

 ILR

22

1

1

 LON

1

22

2

4

2

 MAR

9

1

 NYC

24

1

 OFA

2

18

 PXO

1

1

1

17

 SAC

1

17

 SAO

1

1

1

17

1

 SOF

1

1

8

 STO

16

1

 TOK

1

2

23

 Error rate (%)

35.71

9.52

13.33

18.75

0.00

8.33

0.00

10.00

7.69

10.00

15.00

5.56

29.17

20.00

15.79

8.00

City

AKL

BER

BOG

HAM

HGK

ILR

LON

MAR

NYC

OFA

PXO

SAC

SAO

SOF

STO

TOK

 Average error rate (%)

26.19

12.69

8.89

16.67

2.08

5.56

6.06

13.33

5.13

8.33

18.33

3.70

25.00

33.33

15.79

6.67