In which of the following situations is it necessary to seek permission before flying?

Seeking permission before flying a drone is essential when flying over private property due to the legal rights associated with private land ownership. In many jurisdictions, flying a drone over someone else's property without their consent can lead to legal issues, including potential claims of trespass or invasion of privacy. Landowners have the right to control what happens on their property, which includes aerial activities.

When flying in other contexts, such as a local park, the rules can vary based on the park's regulations, but they may not always require explicit permission. Similarly, flying in a deserted area or above trees typically does not necessitate prior consent as long as the area is not restricted airspace, but caution regarding safety and privacy should always be exercised. However, when it comes to private property, obtaining permission is a crucial step to avoid any legal ramifications.