1. What is most important to you in a frequent flyer program (FFP)?
upgrades, priority services, baggage allowance, good award redemption rates, better award access, lounge access, etc.
>>> Reply: long (at least 3 years) soft expiry, easy to get short haul economy award

2. How many miles do you usually fly each year? How many flights/sectors?
less than 25000 miles, 50000+ miles and 20-25 flights, etc.
>>> Reply: <10 k, most probably 2 - 5 k, about 2 to 6 sectors, on all alliances combined

3. What fare class do you usually buy?
first, business, premium economy, economy
>>> Reply: cheapest cabin

4. Are you able to choose your airlines and/or class of service? Do you travel for work and/or pleasure?
>>> Reply: For international sports competition

5. Which routes do you fly most often?
transatlantic, domestic USA, intra-Asia, etc.
>>> Reply: Short-haul routes on Non-Hong Kong based airlines from Hong Kong

6. What is your home airport?
>>> Reply: HKG

7. Do you have status in any FFP? What is it? How miles do you have banked in each FFP, if any?
>>> Reply: no status, 2763 in delta skymiles

8. What are your preferred airlines, if any?
>>> Reply: any non-HK based airlines

Is Delta Skymiles the best the me since it never expires? Is it of good value to redeem short haul economy flights, or accumulate for decades until I can redeem long-haul flights?