Your request involves planning a flight path for a surveillance drone on a flat Earth model, which contradicts the well-established scientific consensus that the Earth is an oblate spheroid. However, for the sake of intellectual exploration, I’ll outline how such a flight might theoretically be imagined in a flat Earth framework, along with the key navigational challenges.

### Flat Earth Model Assumptions
In many flat Earth theories, the world is depicted as a circular or elliptical disc surrounded by an "ice wall" at the edges, typically representing Antarctica. The North Pole (or central point) is at the center of the disc. The drone would fly in a straight line due south from the Pole toward the outer edge.

### Proposed Flight Path
1. **Departure Point**: Launch the drone from the North Pole (center of the flat Earth).
2. **Direction**: The drone would maintain a constant azimuth (heading) due south (or along a line directly away from the center).
3. **Distance**: The distance to the "ice wall" would depend on the specific flat Earth model. In some interpretations, Antarctica forms an outer ring around the disc, placing the ice wall at a fixed distance from the Pole (e.g., perhaps 6,000–10,000 km away, depending on the map's scaling).
4. **Flight Altitude**: The drone would need to fly at a sufficient altitude to avoid collisions with terrain or obstacles, assuming the flat Earth has varied geography.

### Key Navigational Challenges
1. **Lack of Reference Points**: On a flat Earth map, compass directions (e.g., south) would simply point away from the center, but the drone would have no other reference points to confirm heading or position. Traditional navigation methods like latitude/longitude wouldn’t work, as they rely on a spherical Earth.
2. **No Curving Shortest Path**: On a sphere, the shortest distance between two points is a great circle route. On a flat plane, the straight-line (Euclidean) distance would always be the shortest, but this assumes no physical obstacles (e.g., mountains, oceans) or wind patterns to account for.
3. **Propagation Delay and Communication**: Over long distances, maintaining real-time control or communication with the drone could be challenging if relying on untested flat Earth communication models (e.g., no earth curvature to account for in signal propagation).
4. **Time Zones and Day/Night Cycle**: On a flat Earth with an overhead sun (as in some models), daylight would behave differently. The drone might need to account for a sidereal day or fixed sun path if operating over long distances.
5. **Antarctic Ice Wall Obstacle**: Reaching the ice wall could mean encountering a physical barrier, which would require precise maneuvers to avoid crashing or turning back.
6. **Wind and Weather**: Weather patterns on a flat Earth are unspecified and might not align with observed global wind systems (e.g., jet streams), making flight planning uncertain.

### Practical Implications
- Without a clear understanding of flat Earth dynamics (e.g., gravity, atmosphere, sun’s behavior), designing a reliable flight path would be highly speculative.
- Traditional aerial navigation technologies (GPS, gyroscopes, satellite communication) wouldn’t function as described in flat Earth models, leaving the drone reliant on hypothetical systems.

### Conclusion
While this exercise is interesting from a theoretical perspective, it’s important to note that flat Earth claims lack empirical evidence and are contradicted by centuries of scientific proof (e.g., satellite imagery, physics, circumglobal travel). Modern navigation and aviation are entirely dependent on the spherical Earth model. If you're exploring this for curiosity, it’s a fun thought experiment, but real-world navigation relies on well-established science.