Device for determining a movement corridor for a lightweight aircraft having a weight less than 200 kg and a wingspan of the wings greater than 10 m, the device comprising: a first interface, which is configured to receive aircraft data relating to the lightweight aircraft, wherein the aircraft data at least contain flight properties and functions of the lightweight aircraft; a second interface, which is configured to receive weather data from a weather information source, wherein the weather data are weather predictions and current weather data and at least contain air movements in an altitude profile between a maximum altitude of the lightweight aircraft and the Earth's surface; a processing unit, which is configured to compare the aircraft data to the weather data and to determine a probable movement corridor of the lightweight aircraft; wherein the processing unit is configured to produce a model of the lightweight aircraft based on the aircraft data and to simulate a sequence of waypoints of a flight route on the basis of the weather data using this model and to thereby determine the probable movement corridor of the lightweight aircraft; wherein the device is configured to receive the weather prediction from the weather information source in repeating receiving steps, wherein the weather prediction relates at least to air movements in an altitude profile between a maximum altitude of the lightweight aircraft and the Earth's surface; characterized in that the processing unit is configured to compare the weather predictions from a preceding receiving step to actual weather data from a subsequent receiving step and to determine a deviation between the weather predictions from the preceding receiving step and the actual weather data of the subsequent receiving step in order to determine an uncertainty of the weather prediction therefrom; and the device is configured to apply the current weather data and the weather prediction to the model of the lightweight aircraft and to determine the influence on the movement corridor of the lightweight aircraft in consideration of the uncertainty of the weather prediction and of the properties of the lightweight aircraft. a first interface, which is configured to receive aircraft data relating to the lightweight aircraft, wherein the aircraft data at least contain flight properties and functions of the lightweight aircraft; a second interface, which is configured to receive weather data from a weather information source, wherein the weather data are weather predictions and current weather data and at least contain air movements in an altitude profile between a maximum altitude of the lightweight aircraft and the Earth's surface; a processing unit, which is configured to compare the aircraft data to the weather data and to determine a probable movement corridor of the lightweight aircraft; wherein the processing unit is configured to produce a model of the lightweight aircraft based on the aircraft data and to simulate a sequence of waypoints of a flight route on the basis of the weather data using this model and to thereby determine the probable movement corridor of the lightweight aircraft; wherein the device is configured to receive the weather prediction from the weather information source in repeating receiving steps, wherein the weather prediction relates at least to air movements in an altitude profile between a maximum altitude of the lightweight aircraft and the Earth's surface; characterized in that the processing unit is configured to compare the weather predictions from a preceding receiving step to actual weather data from a subsequent receiving step and to determine a deviation between the weather predictions from the preceding receiving step and the actual weather data of the subsequent receiving step in order to determine an uncertainty of the weather prediction therefrom; and the device is configured to apply the current weather data and the weather prediction to the model of the lightweight aircraft and to determine the influence on the movement corridor of the lightweight aircraft in consideration of the uncertainty of the weather prediction and of the properties of the lightweight aircraft.