Originally Posted by
MSPeconomist
my best guess is yes and no. The last time I went through pre clearance at DUB for a DL flight to ATL, it was a miserable experience, including being stuck in a holding pen in the gate area when it was over.
Plus, you didn't pre-clear customs, only immigration. It took 60 minutes to get through customs in ATL (of course, this included the wait time as on our flight the PRIORITY tagged bags came off last).