Flat Earthers strike again. lol
To headline my post, this is coming from a Concave Hollow Earth view point of view.
I think this might be a trick question, since there is no mention of type of plane, and the distance. I believe this referred to as stall speed. Small planes need to travel at least 60mph,
while larger planes like Boeing 747, need to travel at least 200mph to maintain flight. So, once distance is figure out, than divide by minimum speed to get time, but since you only asked what the minimum speed is....
You did say
someone would have to fly? Are we pretending superman exists for this illustration? The whole question isn't stated very well. The question is missing a few parts.
By looking how many Flat Earth threads there are, I'm guessing that this is an attempt to undermine the Heliocentric model. To try to add to your argument, I will mention that the Heliocentric model also states, that the Earth is orbiting around the sun at 66,000 mph. Which is one fast space ship! lol We are all astronauts if we believe in the Heliocentric model. ha!
It's far easier in my mind to believe, that earth is stationary, but the moon, sun, starts, and planets move. I would suggest, if the heavenly bodies were scaled downed to size like a Concave Hollow Earth Model would point to, the speeds would be far less extreme for the heavenly bodies. No, I don't have the math for this. lol
If this is the argument to explain away the effects of the earth moving with a flying object, than same argument could be made that the earth is standing still. Correct!?! lol It really appears that one could view the earth as stationary and not run into problems with flying or driving a car.
I think a stronger argument for a stationary earth, would be to make main street science prove the earth is moving. No matter what the answer is, it could be debated endlessly. More than likely the answer will be, the Sun and/or stars are stationary. Next question would be, prove the Sun and stars are stationary? Circular reasoning from this point.
The quickest and easiest way to destroy the Heliocentric model is to point to airplanes in flight. Commercial airline flights fly nose up at an angle of 2.5 degrees (about 600mph), Concord jet flew nose up at 5 degrees (1,350mph), and SR-71 at 7-8 degrees (2,100mph). Why you might ask? Well, this is the silver bullet to kill the Heliocentric model.
The faster a plane goes, the higher the nose must pitch upward to maintain altitude. Common sense will tell me that, the faster the plane goes, the nose must pitch more downward to maintain altitude at normal cruising speed, if the earth is convex like the Heliocentric model would imply.