I think people who propose that Singapore acquire aircraft carriers should re-consider and examine their positions.
The costs of running an aircraft carrier would include that of the flight component, aircrew, aircraft complement, and also escorting vessels. An aircraft carrier does not operate in isolation.
The Royal Navy has had decades to formulate operating practices and a tradition. With regards to their Sea Harriers everywhere, those VTOL jets have had a high incident and loss rate.
The aircraft carrier and its escort group will also have a lifespan, likewise the airframes.
Besides the cost, is projecting military power at such costs worthwhile? There are a lot of strategic and cost issues to consider.