DW is scheduled to fly JFK-OSL tonight with infant-in-seat. Her equipment is delayed coming into JFK, so I'm sure her outbound flight will be more than 4 hours late and she'll be eligible for EU 261/2004 compensation of 600EUR per passenger.
Considering how late the flight is departing, she doesn't want to fly tonight, and prefers to fly next week, but also doesn't want to forfeit 1200EUR in compensation. What is the minimum she can do (e.g. show up at the airport and request to be re-accommodated at the check in counter), that she'll still be eligible for compensation but won't have to sit with a baby and wait for a 7pm flight that might take off at 2am or later.
Basically, they are already willing to reschedule her now by phone for free, I would do that but I don't want to forfeit the mandatory EU compensation.
ETA: its delayed more than 5 hours, officially we're eligible for rescheduling and compensation, hopefully we'll get it.