РЕГЛАМЕНТ (ЕС) N 261/2004 ЕВРОПЕЙСКОГО ПАРЛАМЕНТА И СОВЕТА ОБ УСТАНОВЛЕНИИ ОБЩИХ ПРАВИЛ В ОБЛАСТИ КОМПЕНСАЦИИ И СОДЕЙСТВИЯ ПАССАЖИРАМ В СЛУЧАЕ ОТКАЗА В ПОСАДКЕ, ОТМЕНЫ ИЛИ ДЛИТЕЛЬНОЙ ЗАДЕРЖКИ АВИАРЕЙСА И ОБ ОТМЕНЕ РЕГЛАМЕНТА (ЕЭС) N 295/91. Регламент. Европейский Союз. 11.02.04 261/2004

Article 10
                      Upgrading and downgrading

     1.  If  an  operating  air  carrier places a passenger in a class
higher  than  that  for  which  the  ticket  was purchased, it may not
request any supplementary payment.
     2.  If  an  operating  air  carrier places a passenger in a class
lower  than  that  for which the ticket was purchased, it shall within
seven days, by the means provided for in Article 7 (3), reimburse
     (a)  30%  of  the  price  of  the  ticket for all flights of 1500
kilometres or less, or
     (b)  50%  of  the  price  of  the  ticket for all intra-Community
flights  of  more  than  1500  kilometres,  except flights between the
European  territory  of  the  Member  States  and  the French overseas
departments,   and  for  all  other  flights  between  1500  and  3500
kilometres, or
     (c)  75%  of  the price of the ticket for all flights not falling
under  (a) or (b), including flights between the European territory of
the Member States and the French overseas departments.