1: SAN-LAX: 1st of 6 (North America)
2: LAX-HKG: intercontinental
3: HKG-KIX: 1st of 4 (Asia)
4: NRT-HKG: 2nd of 4 (Asia)
5: HKG-BKK: 3rd of 4 (Asia)
6: BKK-SIN: 4th of 4 (Asia)
7: SIN-SYD: intercontinental
8: SYD-AKL: 1st of 4 (Southwest Pacific)
9: AKL-CHC: 2nd of 4 (Southwest Pacific)
10: CHC-SYD: 3rd of 4 (Southwest Pacific)
11: SYD-LHR: intercontinental
12: LHR-TLV: 1st of 4 (Europe)
13: TLV-MAD: 2nd of 4 (Europe)
14: MAD-ATH: 3rd of 4 (Europe)
15: ATH-LHR: 4th of 4 (Europe)
16: LGW-DFW: intercontinental
17: DFW-MIA: 2nd of 6 (North America)
18 Miami-El Salvador 3 of 6
19 El Salvador-Miami 4 of 6
20: MIA-DFW: 5 of 6 (North America)

Is this valid.

Concerns:
1) the ticket validator did not the addition of El Salvador as a north American city.
2) It seems that there are single flight numbers LHR-TLV-MAD-ATH, but I know these are not non-stops. We are at the 20 limit.

Thanks!