A second rhythm on the missions board: one goal for the whole week
The daily missions board asks for three things a day, every day, and resets them at midnight UTC. That works well for anyone who plays most evenings. It works less well for anyone who shows up in bursts, say a full weekend and then nothing until the next one. A daily goal's window is too short to catch that kind of play, no matter how much gets done in the burst. Open /my/missions now and you'll see a new card under the usual three: one goal, and a full week to close it.
One goal, drawn for the week
Each player gets a single weekly mission, assigned the moment they first check the board that ISO week (Monday through Sunday, UTC). It's drawn from a pool of six, reusing counters the daily set and the achievement ladders already track, just with a bigger goal: five new flags caught, three tracks never run before, fifteen spots of any kind, five race finishes, five cargo-drop rounds, or five aircraft claimed from radar scans. Whichever gets drawn stays assigned for the whole week. There's no reroll for it yet, and progress toward it counts from the moment it was drawn, the same rule the daily missions already use.
Uncapped, on purpose
The daily missions and the streak pay Feathers through the same 120-a-day wallet cap that spots and other everyday actions share. A once-a-week reward routed through that cap would land at a fraction of its size on exactly the days a player already earned the most, which defeats the point of a weekly reward. So the weekly mission's 60 Feathers are credited the same way achievement-tier Feathers already are: outside the cap, always in full, with their own line in your Feathers history.
Closing it also secures that day for your streak, exactly like closing a daily mission does. If your weekly mission happens to finish on the same action that closes a daily one too, both still land, neither one is lost, and the streak counts the day once.
The card shows the same progress ring as the daily set, a Go button that takes you to wherever the goal gets done, and a countdown to the next Monday 00:00 UTC, when a fresh one gets drawn.