AMEX Explorer now also has 10.75X on online travel (Airlines, trip.com etc.), previously it was under 5X Category ($3.6/mile -> $1.68/mile)

Although it is capped at HK$10k spend per quarters, that translates to 107,500 points, whereas previously the 5X category was capped to 90000 points per quarter (i.e. HK$18k spend).

So a bit less spend needed to reach a higher point ceiling, pretty neat! (Also makes it better than HSBC Red ($2.5/mile) for online travel, at least until the cap).