HK Express · UO
HK Express is a low-cost carrier with an all-economy layout, differentiated through paid seat selection (front rows / extra-legroom), paid meals and baggage bundles.
The LCC logic is pay-for-what-you-need: add a baggage bundle if you have bags, buy a front-row seat for comfort — bundles are usually cheaper than buying items separately.
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No separate premium cabin, but extra-legroom seats are available for a fee.
Watch paid seat selection after check-in opens and bid-upgrade offers; off-peak flights have higher upgrade success rates.
Internationally, Business usually adds one checked piece (or higher weight) over Economy and allows two carry-ons. See the HK Express baggage page.