Flight on Mars and aerodynamics considerations
The airplane flies at a speed of ~40 m/s and operates in the region ±45 above and below the Martian equator at a nominal height of ~1 to 2 km from the Martian Surface. It can cover a distance of ~1700 km during a 12-hour period. This allows the airplane to reach different areas of interest.
Due to distance covered during a day, flying with the sun increases daylight. And to reduce the night duration, the airplane shall fly in the other direction (desirable). Scientific instruments collect data and transmit to Earth via Mars orbiter. At the same time, the airplane stores as much energy as possible for the night survival flight.