American is a $43 billion company. SpaceX is already valued at over $30 billion.
Elon would want to fly fleets of 100 Starships every two years to Mars over a twenty-year period. This would put 1 million tons of cargo onto Mars.
The cost of each Super Heavy Starship will eventually be around $100 million each. This is comparable the price of a 737 which are $90-135 million. The 777 costs about $300-450 million. A 787 costs about $240-350 million.
If SpaceX develops a fleet of 100 Super Heavy Starships for a massive Earth Orbit and Cis-lunar support fleet and they were flying once per day then they could move about 5 million tons to orbit every year. This would ten thousands times more than the 500 tons per year that are currently placed in orbit.