~2008, CO Express: just after my flight from DAY blocked in, CLE ramp ops shut down for the better part of an hour and a half for thunderstorms, about the time the door closed on the connection to IAD, the captain came on the PA to apologize that we were facing a pushback delay of an hour or more due to weather along the route
a few minutes later he announced that he had talked to ATC; we now had a VFR departure with an interim clearance to 8000 feet, a final cruise altitude of 14000 feet, and a wheels-up time in 10 minutes