If you did read the ads on the papers, it's written as ferry svc
from Pasir Ris Int to Singapore Airshow
i was shocked SMRT handled the ferry svc as Airshow ads were
plastered on SBST DDs, SDs.
All Airshows ferry svcs depart fr Pasir Ris Int, so organisers
would not want to change that, the reason for Expo station not
being chosen is to reduce confusion of pple actuaaly stopping at
Changi Airport Station. For Pasir Ris station pple would know it's
the end of the east line, no nd to be confuse where to alight coz
it's the last stop.
SMRT buses did allow pple to stand till the door and standing is
allowed on the bus as witnessed by me at the show on saturday for
Pasir Ris MRT ferry
Bad thing about SMRt was buses were parking along Pasir Ris Dr 3
near the junction of Pasir Ris St 52, making it difficult for sv15
to turn right into Pasir Ris Dr 3. 
SMRT buses were idling along Pasir Ris Dr 3 when there should
waiting to pick up passengers os Pasir Ris MRT station.
The queue as at 1100hrs on sat began at the junction of Pasir
Ris Central[nearer to Downtown East side, where sv89 turns
right],Pasir Ris Dr 3.
By 1145hrs, 3 police cars and 2 hilux pickups in Pasir Ris Int
with MIBs figuring what to do.
For info, the queue is from the bus stop diagonally to Pasir Ris
Int, turn at the sheltered walkway to the station
entrance facing white sands, u turn up again up to the
sheltered walkway at the interchange turn right into the
interchange proper to the other side of the interchange
end out to the field near the junction of Pasir
Ris Central n Pasir Ris Dr 3[junction where sv89 turns
right]
LOuSY planning!