Two planes in difficulties land at Amsterdam airport
"An airplane of Delta Airlines, which had departed from Schiphol, had technical difficulties and has returned safely," the airport spokeswoman said.
"We are still investigating the second plane," she said.
A spokesman for Delta Airlines confirmed that a Delta passenger plane had made an unscheduled landing. The identity of the second plane was not immediately available.
(Reporting by Gilbert Kreijger; Editing by Kevin Liffey)