Flight Lines F l i g h t Li n es: A fl i g ht l i n e is a destinat i on with a completed r eturn. Eve r y fl i g ht y ou l o g mu s t connect b a ck to the original starting point to end t he fli g ht l in e . E x amp l es:   I f your Hub is Seattle ( K S EA), you will fly from Seattle to Denver (KDEN), then ei t her r e t urn to S eat t le to c omp l ete a fli g ht l i ne or f l y from Denver to L os A n gele s , from L os A n g eles b a ck to S eat t le ( y o ur st a rting poin t ) comp l et i ng y our fl i g ht l i ne. The r e a re no l i m i ts on stops y ou ma k e if th e y a re a desi g na t ed P AY fli g ht. You will, be required to end up back at y o u r Hub or starting point to comp l ete the l i ne.