Singapore: Changing wind direction necessitates northerly flight path to Seletar Airport
"Flight procedures for both directions are necessary because aircraft land and take off into the wind. In this region, winds blow from a north-easterly direction for half of the year, and a south-westerly direction for the other half of the year. Therefore, flight procedures for a southerly approach cannot safely replace all flight procedures for the northerly approach," said Singapore's Transport Ministry.