Https://forum.plarium.com/nords-heroes-of-the-north-browser/345_game-discussion/1721050_full-list-of-frontier-airlines---customer---service-numbers-in-usa-the-detailed-guide/ https://forum.plarium.com/nords-heroes-of-the-north-browser/345_game-discussion/1721050_full-list-of-frontier-airlines---customer---service-numbers-in-usa-the-detailed-guide/