Singapore is a member of Star Alliance. Its U.S. members include United Airlines and U.S. Airways. U.S. Airways may not remain a member, since it is merging with American Airlines, but United will. Members of any Star Alliance frequent flyer program can earn miles for flights on any member's flights and can redeem miles/points for flights with any member.
Yes you can. Qantas and BA are part of the OneWorld alliance and reciprocate on their frequent flier programs.
There are a number of frequent flyer programs available from all major airlines. I personally like the Hawaiian Air Miles program as well as the Delta Sky Mile program.
The Singapore Flyer
American Airlines Advantage, Delta Sky Miles, and US Airways Dividend Miles are rated as very good programs by Business Travellogue. The tell you what the rewards are and how to get them at http://www.businesstravellogue.com/best-frequent-flyer-programs.
The vast majority of the major airlines around the world have frequent flier programs.
The Singapore Flyer is a private limited company incorporated in Singapore. The Singapore Flyer company was formed in early 2000 as the developer for the Singapore Flyer, the world's tallest observation or ferris wheel.
Tripadvisor.com can give you a variety of reviews for hotels and attractions, but they do not specialize in rating frequent flyer programs. The website http://www.webflyer.com bills itself as an authority on frequent flyer programs and has a lot of good information.
Yes, that is usually the case in most FF programs.
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The Singapore Flyer primarily serves as a tourist attraction to encourage people to come to SIngapore.
You can apply for most frequent flyer programs on the airline's web site. Be sure to present your frequent flyer card when you check in for each flight, because sometimes it can be a hassle to get credit for miles retroactively.
The Singapore Flyer is 165m tall, 30m taller than the London eye