Singapore Airlines (IATA: SQ; ICAO: SIA)  is a Singaporean airline which flies to Asia, America, and Europe. It is commonly referred by both the flight number prefix (SQ), and the ICAO code (SIA). Singapore Airlines, together with Hong Kong's Cathay Pacific, have consistently been ranked among the best airlines in the world in terms of customer service.
Despite the advent of budget carriers in the region recent times, Singapore Airlines continues to stick religiously to its branding model as a premium airline, and does not cut any corners when it comes to customer service, and as such is ideal for those willing to pay a premium for better inflight service. On the downside, fares are usually significantly higher than many of its competitors such as Qantas and Emirates, though prices do come down significantly during occassional promotions, particularly during the off-peak season, and can be good value for money.
More information at http://www.singaporeair.com/saa/en_UK/content/company_info/siastory/fleet.jsp
Frequent flyer program
SIA has two frequent flyer programs:
Miles are valid for only three years. They may be extended by up to 1 year for a fee.
A 15 % discount is applicable for redeeming KrisFlyer miles online.
SIA lounges are known as Silver Kris; there are seventeen of them, at:
First and Business Class customers, PPS Club; KrisFlyer Elite Gold, and Star Allaince Gold members are eligible to use these lounges. They may also use facilities of other Star Alliance airlines.
Singapore Airlines is part of the Star Alliance.
Passengers with certain special needs are accommodated, more information at the website.
Certified guide dogs are allowed to travel with their owner in the passenger cabin at no extra charge. The dog may not take up a seat and must be muzzled and harnessed. Only one dog per flight is allowed, so it is advisable that you contact the airline and make arrangements in advance.
In some regions, such as Australia, a person escorting a disabled flyer may receive up to 50% discount on their ticket price.