Why do miles when booking not match whats credited to mileage plan?
3 quick examples
ANC/SEA always says 1444 when booking yet you get 1448 credited
SEA/ORD always says 1715 when booking yet you get 1720 credited
PDX/ORD always says 1734 when booking yet you get 1739 credited
and then some routes both match like ANC/FAI it says 261 and you get credited 261 plus the 239 bonues to be 500