The route swap was a series of deals between the two carriers due to the increase in oil prices at the time that made many of their services unprofitable. TWA gave up it's worldwide services, meaning it stopped service to Honolulu, Guam, Okinawa, Taipei, Hong Kong, Bangkok and Bombay. Also TWA gave up all services to Frankfurt. In addition service to London was suspended from IAD
and limited through services from SFO
Pan Am for its part gave up all service from Boston and Chicago across the Atlantic. This meant abandoning Pan Am's BOS
-CMN and BOS
services. As part of the agreement could still serve it's SJU
to Madrid flights, since Pan Am had never served MAD
from either JFK
. So Pan Am effectively pulled out of Barcelona, Casablanca, Lisbon, Paris. Rome was never part of the route swap.
There was also another route swap in 1975, between American Airlines and Pan Am. American gave up its Australian and South Pacific routes which had been inaugurated in 1970 and Pan Am gave over many Caribbean flights to AA
Since the deal was only temporary, TWA resumed service to FRA
in 1978 and Pan Am to Paris in 1980 when it took over National's routes from MIA
. Throughout the 1980s both carriers began flying to cities in Europe that had originally been in each other's domain. For instance TWA began flying to Scandinavia, the Low Countries, German cities. Pan Am for its part began service to Athens, Madrid (from JFK
), Milan, Tel Aviv just to name a few cities.
The situation with Braniff and Pan Am was because Braniff bought Panagra which was originally a Pan Am subsidiary that flew the Andean routes or Western South America in 1967. Most of these agreements weren't unwritten but written in stone. This was a different time before free skies when airlines couldn't just file an application with the DOT for service to a new foreign city. International airline service was highly regulated meaning foreign governments signed bilateral treaties regulating the amount of carriers on a route, the number of frequencies, the size of the aircraft used, the fares etc. Even if Pan Am wanted to start service to Lima in 1980 it probably wouldn't have been allowed to do so.