Looking at DUS-EWR on basic fare. Do they, as part of standard procedure, weight carryon at gate? I know airberlin did that at DUS. If weight is exceeded, how much do they charge at the gate to transport in hold?

One way is $210 USD with tax included. Alternatively I can buy a round trip on IB/BA and throw away the return for $300. IB didn’t weight my carryon.

Thanks.