Ratio Distance

**CLI Output Name**: -o ratioDistance

**Input**: a flight record file

**Print**: the ratio between the distance actually done and the point-to-point distance between the take off and landing

Start by locating the CLI entry point that handles output names and the code that reads a flight record file. Trace how existing distance-related outputs are calculated, then define done as supporting -o ratioDistance and printing the ratio of actual distance to the take-off-to-landing point-to-point distance. No test or file path is mentioned in the issue.

Written by the indexing model from the issue text.