Tan, i guess, for this, there is really nothing we can do as punggol is excatly under the take off route for aircrafts from PLAB, and landing route for commerical aircrafts to ST Areospace via PLAB. I believe the increase in the frequent is due to the NDP, and the Air Force Open house Air Show display at PLAB. The Aircrafts are flying high speed across the airbase, and thats may create louder sound. In fact area from hougang to sengkeng, Eunos, Paya Lebar all will be affected. Actually, we are more lucky then people from hougang (the landing path)..there, you will experience everyday the sound of aircrafts.