Error Recovery — Past Departure Time

Problem/Feature Description

A pilot ran a weather briefing two days ago for a flight from Nashville to Las Vegas on March 20, 2026 departing at 16:00 UTC, 16,000 feet, 155 knots TAS. The briefing was run with --cache so cached data exists.

Now they want to look at that briefing again, but when they try to run the original command they get the error: "Departure time is more than 2 hours in the past."

Help them regenerate the briefing.

Output Specification

Produce the exact python3 flightweather.py command that will work despite the departure time being in the past. Write it to run_briefing.sh and explain in notes.md why the original command failed and how the solution works.