<prompt> Translate the following text to EnglishKwa kuongezea, viti vichache vya ndege za mara kwa mara vilikuwa vinapatikana kwa nyakati za kusafiri zinazohitajika, uhamisho wa tiketi za bure kwa wafanyikazi wengine ulichukua wakati na juhudi, na wafanyikazi waliosafiri kwa ndege tofauti mara nyingi walichukua muda mrefu kukusanya maili ya kutosha kwa safari za bure.  <response>: Furthermore, few frequent flyer seats were available at desired travel times, transfers of free tickets to other employees took time and effort, and employees who flew on different airlines often took a long time to accumulate enough miles for free trips. 