Singapore Airlines And Turkish Airlines To Expand Codeshare Agreement 05 March 2014 - Singapore Airlines and Turkish Airlines have agreed a major expansion of codeshare ties, covering destinations beyond both Istanbul and Singapore. Singapore Airlines will also increase frequency on a seasonal basis between Singapore and Istanbul to six times per week to meet growth in demand on the route. The Star Alliance partners have been codesharing on each other’s flights between Singapore and Istanbul since February 2009. Singapore Airlines currently operates four weekly flights on the route while Turkish Airlines operates seven weekly flights. Under the expansion of the agreement, Singapore Airlines will add its ‘SQ’ designator code to Turkish Airlines-operated flights beyond Istanbul to destinations within Turkey, as well as to points in Africa, Europe, the Middle East and North America. ... The expanded codeshare ties are expected to take effect from 1 May 2014, subject to regulatory approvals. Singapore Airlines’ increase in frequency on the Singapore-Istanbul route to six flights per week is due to take effect from 26 May 2014. ...  Six flights to be operated per week during the Northern Summer operating season and four per week during the Northern Winter operating season.