We don't have flight itineraries comes through Concur based on our configuratoin and use of a ghost card.
I have seen issues where the credit card charge and receipt matches even though it shouldn't match. It's usually because it's the same type of expense like rental car or the amounts are very close. This may not help but do you utilize the credit card mapping feature? That can help if you tie MCCC codes to specific expense types so the LInkedIn charge would have nothing to do with flights.
