Interesting that Singapore is waiving the ICAO flag.
Not too long ago (it is all in the PPRuNe archives) when I fought SIA in the United States Federal court over SIA's unsafe flight operations (First officer in the Captain's seat without proper training and license as required by ICAO annexes), all the loyal soldiers of SIA in endless PPRuNe posts laughed at the ICAO annexes. They called it advisory only but not mandatory (are you reading this Si?).
Now they are waiving the ICAO flag and the attached annexes. After dealing with CAAS (CAA Singapore) and SIA I must express my opinion. They are a joke.
Outcome of the case, they had to stop this practice.