Originally Posted by
travelinfoo
I'm will become Silver after the first part of my flight. Can I use the lounge for the return even though I won't have my card yet? Will my new status be listed when I give the lounge monitors my FFN? Will my boarding pass on the return flight reflect my new status?
Yes.
Same happened with my other half last Christmas. Blue on the way out, Silver on the PYOB on the return trip. I was surprised, as I didn't think TATL cheapo economy would qualify for the "4 BA flights" thing - but it did.
(She had stacks of TPs, but only 2 BA metal trips that year)