Senior Moderator, Moderator: Community Buzz and Ambassador: Miles & More (Lufthansa, Austrian, Swiss, and other partners)
Join Date: Jun 2005
Location: 150km from MAN
Programs: LH SEN** HH Diamond
Posts: 29,518
If you are booked on LH573 and LH422 you have over 6 hours in FRA. Just say you want to check the bag to FRA as you need to do some shopping or have something in the bag to give to a friend in FRA. Don't mention anything about connecting to another flight since that tells the airline you are not taking the flight to BOS.