By Angeliki Koutantou and Pablo Mayo Cerqueiro ATHENS (Reuters) -Greece on Thursday will launch an initial public offering (IPO) for a 30% stake in Athens International Airport, a sale which along with a company dividend could yield up to 1.2 billion euros ($1.3 billion) for the state, according to sources. The country is selling 90 million shares, through a combined offering to Greek and foreign investors and existing shareholders, in its biggest IPO after its 2010-2018 debt crisis. Athens International Airport, the operator of Greece’s biggest airport, has set the price range for its IPO at …