The pilot told the control tower that he'd run into technical trouble.

该飞行员告诉航空站说他遇到了技术问题。

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He said he and his pilot watched the second plane hit the south tower from the helicopter.

在直升机上，他说他和他的飞行员看到第二架飞机撞上南边的塔。

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Landing: the pilot receives landing clearance from the Local Controller in the airport's control tower to landing on a designated runway.

落地：飞行员从机场塔台的进场管制员处得到落地许可，操作飞机降落在预订跑道上。

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It rolled and crashed vertically into the ground before the tower could alert the pilot, Plagens said.

CNN: One killed in California plane crash

"Hey, that Japan Air may know it but they have fuel spewing out the leftward wing quite a bit, " the pilot of another plane told the control tower, which radioed the JAL crew and halted takeoff.

CNN: Airline: Dreamliner fuel leak due to an open valve