Source: Pwinsider.com

The Undertaker has been spotted at the airport in Buffalo, the host city of tonight's Old School edition of RAW.

There was also a report that Undertaker and John Cena were seen together in Pittsburgh on their way to Buffalo.

UPDATE: The Undertaker has arrived backstage at RAW in Buffalo, NY and will be appearing tonight to set up a WrestleMania bout against CM Punk.