Timegating. Yes I know. Yadda yadda. Complain about how we can’t grind rep at our own pace. Yadda yadda.
Now on to the meat of the post, where we get you as much rep per day as possible, with as minimal effort as possible.
This is expecting you to have already done the intro quests to Mechagon.
Step 1: Head to Curseforge, or use the Curse/Twitch client to download the addon “Handynotes - Mechagon” (You can also pick up the one for Nazjatar while you are at it)
Step 2: Start off by picking up the quests around Rustbolt and completing them. Easy 400-600 Rep.
Step 3: Do the daily “World Quest” that awards 850 rep
Step 4: Now on to the meat of the grind. Open your Group Finder and look for groups titled something like “Mechagon Rare farming” Using the Handynotes addon and listening for call outs, you can easily kill 10+ rares in an hour of being at Mechagon. That is an easy 750+ rep. Just for joining a group.
Just repeat daily and you should have flying in no time.
By my calculations, from me just casually using this method, I should have the Rustbolt Resistance to Revered in 5 days. Meaning that you can realistically unlock flying within a week of the patch day.