Another transfer window, another important Arsenal player heading out the Emirates exit door.
Alexis Sanchez has completed his megabucks move to Manchester United in the latest example of Arsenal selling an influential player to a direct rival in the Premier League.
It's been a trend that has continued for over a decade since Ashley Cole moved across London's football fault line to Chelsea.
Sometimes, the buyer has got the better deal with their signing going on to achieve great things. On other occasions, Arsenal have been justified in their decision to sell.