Formerly Constantinople, Istanbul is one of the most richly diverse and historical cities in the world. There are two airports in Istanbul, Istanbul Ataturk Airport, located on the European side and one of the busiest airports in Europe, and the secondary Sabiha Gokcen International Airport, located on the Asian side.
It's very easy to take flights to London from Istanbul with flights leaving regularly from both airports. Ataturk Airport was originally opened for military purposes in 1912 before becoming a civilian airport after 1949. It is named after Ataturk, founder of the Republic. Sabiha Gokcen Airport was named after the first ever female pilot of Turkey, who also served as a fighter pilot in the war.