The two have nothing to do with each other. A carrier must be a "flag carrier" before it can fly international service. United, Delta, Frontier, Airtran, etc. are all "flag carriers".
§301-10.133 What is a U.S. flag air carrier?
An air carrier which holds a certificate under 49 U.S.C. 41102 but does not include a foreign air carrier operating under a permit.
US Flag Air Carriers
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In order for a flight to be in compliance with the Fly America Act, the code of a U.S. flag air carrier must be noted as part of the flight number on the airline ticket, flight coupon (boarding pass), or passenger receipt. Each airline has a two letter alpha code. For example, United Airlines has a code of "UA". On an airline ticket, boarding pass or passenger receipt, this two digit code is designated just to the left of the flight number. From this list, you will be able to compare airline codes on the ticket with those on the list and thereby be able to ascertain whether or not the flight is on a US Flag air carrier.
A detailed list of U.S. flag air carriers is set forth below:
· Airtran Airways (FL)
· Alaska Airlines (AS)
· America West Airlines (HP)
· American Airlines (AA)
· American Trans Air (TZ)
· Continental Airlines (CO)
· Delta Airlines (DL)
· Frontier Airlines (F9)
· Hawaiian Airlines (HA)
· Midwest Express (YX)
· Northwest Airlines (NW)
· Southwest Airlines (WN)
· Spirit Airlines (NK)
· United Airlines (UA)
· US Airways (US)
😛 😛 😛
Southwest has not met the requirements of a US "flag carrier", which means it cannot start international service until it does so. This process costs $s, and as of yet I have not seen WN make any attempts to get this done.
See above to prove your post wrong, sorry to sadden you.