Why would you be pricing same day flights, everyone knows those prices are jacked up in the US. The only people who would be in the market for those are people travelling for business, not the average middle class person you keep bringing up.
This is purposely skewing the comparison.
Most of the people that get same day flights from Atlanta to Dubai are your average middle class. They need the cheapest option and it is not a luxury. The same you would see in the US.