I guess that a liquid fuel rocket engine would count as an engine.
What about a solid fuel rocket?
If that doesn't count as an engine, a plane could take off with solid fuel rockets and then glide a great distance to its destination.
JATO (acronym for jet-assisted take-off), is a type of assisted take-off for helping overloaded aircraft into the air by providing additional thrust in the form of small rockets. The term JATO is used interchangeably with the (more specific) term RATO, for rocket-assisted take-off (or, in RAF parlance, RATOG, for rocket-assisted take-off gear).
There has been speculation about intercontinental rocket powered bombers or passenger planes which would use rockets to boost them above most of the atmosphere and then use falling back into the atmosphere to skip like a stone on water and travel halfway around the world.
The Amerikabomber (English: America bomber) project was an initiative of the German Ministry of Aviation (Reichsluftfahrtministerium) to obtain a long-range strategic bomber for the Luftwaffe that would be capable of striking the United States (specifically New York City) from Germany, a round-trip distance of about 11,600 km (7,200 mi). The concept was raised as early as 1938, but advanced, cogent plans for such a long-range strategic bomber design did not begin to appear before Reichsmarschall Hermann Göring until early 1942. Various proposals were put forward, but these plans were all eventually abandoned as they were too expensive, too reliant on rapidly-diminishing materiel and production capacity, and/or technically unfeasible.
Other designs were rockets with wings. Perhaps the best-known of these today is Eugen Sänger's pre-war Silbervogel ("Silverbird") sub-orbital bomber. While the A4b rocket, winged version of the V-2 rocket and probably its successor A9 rocket were tested several times in late 1944/early 1945, the A9/A10 Amerika-Rakete, planned as a full 2-staged ICBM, remained a project.
Silbervogel (German for "silver bird") was a design for a liquid-propellant rocket-powered sub-orbital bomber produced by Eugen Sänger and Irene Bredt in the late 1930s for The Third Reich/Nazi Germany. It is also known as the RaBo (Raketenbomber – "rocket bomber"). It was one of a number of designs considered for the Amerika Bomber mission, which started in the spring of 1942, being focused solely on trans-Atlantic-range piston-engined strategic bombers, like the Messerschmitt Me 264 and Junkers Ju 390, the only two airframe types actually built and flown for the competition. When Walter Dornberger attempted to create interest in military spaceplanes in the United States after World War II, he chose the more diplomatic term antipodal bomber.
It was designed to be launched from a rocket sled on a track and then use its own rocket engine to reach the upper atmosphere and then bounce and skip off the stratosphere several times as it crossed the world. It was the first design of a space plane using a lifting body form, like the space shuttle used.
If solid fuel rockets doen't count as engines, such a space plane could be built using solid fuel rockets instead of liquid fuel rockets.
So if solid fuel rockets don't count as engines rocket launched gliders or space planes could be used for long distance air travel.
If solid fuel rockets do count as engines, i guess that biochemestry doesn't work on that planet and nothing can live there.