| Airline | Notes |
Economy |
Premium Economy | Business | First |
| UPGRADE | UPGRADE | ||||
|
|
See Notes* | KRTWSKY | KRTWSKY | IRTWSKY | IRTWSKY |
| AF | K | W | I/Y | F (not within Europe) | |
| AM | K | I | |||
| AR | K | S | I/W | ||
| AZ | K | A | I/Y | ||
| CI | K | E | D/Y | ||
| DL | See Notes† | K | G (not within area 1) | I (A/Y-w/in US) | F (not within area 1/Europe) |
| FM | K | D (P- w/in China) |
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| GA | See Notes^ | K | D/Y ^ | A/F | |
| KE | K | D (C/Y-w/in Korea) | F/P | ||
| KL | K | I/Y | |||
| KQ | K | I | |||
| ME | K | I | |||
| MF | K | D (D/A-w/in China) |
A | ||
| MU | K | W | D/Y (D/P/Y-w/in China) |
F | |
| OK | K | D/Y | |||
| RO | K | D (Y-w/in RO) |
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| SU | K | A | D/Y | ||
| SV | K | I | A | ||
| UX | K | I/Y | |||
| VN | K | U | D | ||
|
†DL FLTS - US-US and US-CA. If *I* calss is not offered, Ok to book *A* for Business Fares. ^GA sectors operated by ATR service in all economy. *Original fare basis applies in case of an upgrade |
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