Besides Uber & Taxis - what a joke having to pay to pick-up friends & family at the airport unless you ask them to take a long hike past P3.  What's next? Will they start charging people that drop friends & family off at the airport???

So... in the past I always used THE WING - it sounds like THE PIER is where I will be heading next time I'm in HKG. Do you know if CX is planning to revamp THE WING eventually?

I'm using TripCase - www.tripcase.com - probably not as sophisticate as TripIt  but it works well and it's totally free. Definitely a good alternative if you are after a travel monitoring website & smartphone app combo but don't want to pay US$49 for the service...

I really doubt it, they'll want to see a physical card to gain entrance

If the service provider (eg taxi, train, budget airline) does not accept AMEX then you are still covered by the travel insurance, see below from their T&Cs: American Express Not Accepted Cover is effective if You cannot pay the full fare for a Trip on Your American Express Platinum Car...