subsonically

They were due west of Ireland, flying subsonically, descending slowly.

"If you could move that much information subsonically, the navy would be using it for submarines.

Therefore, supersonic transports of this period will have to operate subsonically over land.

The Pegasus had to fly subsonically over land.

An aircraft able to operate for extended periods at supersonic speeds has a potential range advantage over a similar design operating subsonically.

The actual intercept was done subsonically.

It will fly subsonically.

It was shown as effective in terms of ballistics, firing a 500 grain bullet subsonically, but not ideally suited for its role due to the size and weight of the platform.

The outflows or jets from young stellar objects or disks around black holes can also be transonic since they start subsonically and at a far distance they are invariably supersonic.

"Designed to carry bombs and air-launched cruise missiles," the booklet said, "the Blackjack can cruise subsonically over long ranges, perform high-altitude supersonic dash, and attack utilizing low-altitude, high-subsonic penetration maneuvers."

Supersonic aircraft must have considerably more power than subsonic aircraft require to overcome this wave drag, and although cruising performance above transonic speed is more efficient, it is still less efficient than flying subsonically.

It has been suggested that Concorde was not withdrawn for the reasons usually given but that it became apparent during the grounding of Concorde that the airlines could make more profit carrying first class passengers subsonically.

Dr. Ray Ashton, who runs the Finca de la Tortuga biological preserve in Archer, Fla., has highly preliminary evidence that some turtle species may communicate subsonically, just as elephants do, transmitting and detecting ultralow frequency sound waves as vibrations in the ground.

In the 1980s, FedEx planned, but later abandoned, a joint service with British Airways to have BA fly a Concorde to Shannon, Ireland with FedEx packages onboard and then FedEx would have flown the packages subsonically to their delivery points in Europe.