United ???????????????????????????????? ???????????????????????????????????????????????? ???????????????????????? ???????????????????????????????? ???? "????????-???????????????????? ???????????????? ????????????????????????????????????????????????" ???????????????????? ???????????????????????? ???????????? ???????? ???????????????????????? ???????????????? ???????????????????????????... https://central.xero.com/s/question/0D58V00009SGbFHSA1/travel-united-how-far-in-advance-does-united-allow-cancellations