Match the number of seats among various 777 types listed at:
https://www.koreanair.com/global/en/...leet-info.html
77Q: 338 seater 773 non-ER
77W: 291 seater 773ER
77I: 277 seater 773ER with the newest F/C products include prestige suites
77K: 261 seater 772ER with lie-angle C (prestige plus)
77S: 248 seater 772ER
77X: 772 cargo