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This involves predicting the “compression” that occurs between each pair of aircraft as the lead plane decelerates to its landing speed.

Homendy also said it was too soon to say whether the pilot had control of the helicopter during the steep, high-speed descent, although she noted that “it wouldn’t be a normal landing speed.”

Homendy also said it was too soon to say whether the pilot had control of the helicopter during the steep, high-speed descent, although she noted that “it wouldn’t be a normal landing speed.”

CEO Elon Musk said that the rocket's landing speed was close to the maximum the vehicle can handle.

SpaceX founder and chief executive Elon Musk said via Twitter that the rocket's landing speed was close to the design maximum, thus the back and forth motion.