Change of name by deed poll
My sister has just reverted to her maiden name by deed poll, following a divorce. She is required to apply for a new passport in her new legal name but has four return flights booked for the next couple of months, with four different airlines - Lufthansa, Air Baltic, British Airways and Easyjet - in her previous, married name.
I have discovered online that Easyjet will change the name on a ticket if you fax the deed poll document to them at least a month before travel, but I can't find definitive statements of policy for the other three airlines. Are there any airline employees here who can tell me with certainty what the policies of the other airlines are? Will any of them require the purchase of a new ticket?