UPNAWAY,
you might want to check a few facts before you jump to the conclusion that sheer size results in better revenue.
Two numbers will do:
Consolidated passenger yield: (the amount of revenue per mile that an airline collects from paying passengers, expressed in cents, here including mainline and regional operations)
DL- 16.85
US - 16.75
AA - 16.36
UA - 15.96
WN - 15.94
And the second number - mainline CASM ex-specials, fuel, profit sharing (the base cost to fly a mainline seat for one mile, also in cents).
Both of these sets of statistics are for the 3rd quarter of 2013; all of the network carriers have reported this data in the past week.
WN - 7.80
DL- 7.96
US - 8.08
AA - 8.48
UA - 8.75
Yes, there are some mileage adjustments that can be made because airlines that have shorter haul operations tend to have higher CASMs and RASMs.
As you know, UA has the longest average passenger length among US carriers followed shortly by DL because of the large Pacific operations both carriers have.
AA is next followed by US and then WN.
But notice that the second figure, costs, tells an even bigger story because the "distance" between the top number (revenue) and the bottom number (cost) very closely correlates to profit.
Thus, DL even though it was not the largest carrier had both higher revenues and lower costs. WN had lower revenue than the network carriers but much lower costs.
US is in a pretty good position with respect to both numbers relative to their peers.
AA is not as strong on either number as DL or US but better than UA.
And then poor UA has the highest costs but the lowest revenue among the US int'l carriers.
Size doesn't translate to profits or even revenues. If size were the sole factor, UA should be doing much better than they are.
The ability to maximize revenues and control costs is the solution to financial success in any business.
ON that basis, US will be trading their current position, even if it has limited growth potential, for a less advantageous position with the merged AA.
The good thing for AA and US is that they are better off than UA; the bad news is that they are both beat by other carriers including DL and the low fare carriers.