Originally Posted by
SamZeb
Wonder if the airline credit can be used towards a lounge 'membership'
Probably not. The benefit requires a ticket purchase in conjunction with the fee. It's not known how American Express' system will use the ticket information to validate the fees.
[Speculation] I suppose it might be possible to purchase a membership at a club during a trip and have the charge appear in the correct date range.
[/Speculation]