Four more airlines will join Singapore Airlines at Changi Airport's newly opened Terminal 3 from March 26 this year.

Passengers of Qatar Airways, China Eastern Airlines, Jet Airways and United Airlines will depart from and arrive at Terminal 3 instead of Terminal 1.

The Civil Aviation Authority of Singapore (CAAS) is facilitating the airlines' shift by conducting trials to prepare them for operations.

Mr Lim Kim Choon, CAAS Director-General and Chief Executive Officer said the move will 'enable CAAS to optimise the capacity and facilities of the terminals at Changi Airport'.

The four airlines are undergoing integrated airport system trials involving passenger check-in, baggage handling, staff familiarisation and 'live' commercial trial flights.

CAAS is also updating airport directories and signs within the terminal buildings as well as disseminating circulars and decals to transport service providers such as coaches and taxi drivers to raise awareness about the shift.

China Eastern Airlines, Jet Airways, Qatar airways and United Airlines operate a total of 148 weekly flights from Singapore to 12 cities - Shanghai, Kunming, Mumbai, Chenai, Delhi, Doha, Jakarta, Atlanta, Chicago, Hong Kong, Tokyo and Washington DC.