Flight operations at Istanbul Airport, Europe’s busiest, were mostly suspended through Tuesday afternoon due to heavy snowfall that has caused travel chaos across Turkey’s biggest city. The airport managed to open only one runway to allow flights from overseas such as the US, Canada and Mexico land, operating firm IGA and national carrier Turkish Airlines confirmed to dpa. No planes are planned to take off from Istanbul Airport until midnight on Tuesday, a Turkish Airlines spokesperson said, adding there were no major disruptions at the smaller Sabiha Gokcen Airport, on the Asian side of the c…