The Chitauri used these chariots, which resembled jet skis, during the Battle of New York, as their main method of air combat. Due to their speed, the chariots had poor handling, making a chase through numerous turns difficult. The chariots were disabled when the Chitauri Command Center was destroyed.
During the clean-up, the chariots fell into the custody of the United States Air Force, who found transceivers in one of the chariots. The HYDRA members within the Air Force, led by General Fischer, used a transceiver to send out a signal in an attempt to contact extraterrestrials, resulting in the Confederacy shifting their focus on Earth and striking an alliance with HYDRA.
During the Battle of Earth, many Chitauri that time-traveled used these chariots to attack their enemies from the air. The chariots were eventually destroyed when Iron Man used the Infinity Stones to disintegrate Thanos and his entire army.