FlyerTalk Evangelist and Ambassador: The British Airways Club
Join Date: Jun 2008
Location: Somewhere between 0 and 13,000 metres high
Programs: AF/KL Life Plat, BA GGL+GfL, ALL Diam, Hilton Diam, Marriott Gold, blablablah, etc
Posts: 33,177
I second irishguy28's comment. I would add that if it indeed does not 'retain' your FB number, chances are that this is due to some mismatch between the way your name was registered on your reservation vs on your FB account. Any difference such as middle name etc could lead to the system not recognising the card/name match automatically (but typically solved when you manually enter your number at check in or possibly by an agent on the phone)