An AirAsia Indonesia-Singapore flight with 162 people on board lost contact with air traffic control, with search operations suspended for the night.
U.S. stock index futures signaled a higher open on Wednesday, with volumes expected to be thin as markets close early for the Christmas holiday.
Former President George H.W. Bush, age 90, was taken to a Houston hospital after experiencing shortness of breath, a statement from his office said.
European shares closed higher on Tuesday, with revised growth data from the U.S. and record gains on Wall Street boosting sentiment.
European shares closed mixed on Friday, with Italian banking stocks and the health care sector weighing on wider benchmarks.