Anyway, I have come up with a basic itinerary for the trip.
April 30 -- Fly out of Cincinnati, layover in Atlanta, fly to Madrid
May 1 -- Arrive in Madrid
May 4/5 -- Leave Madrid by train and arrive in Paris
May 9 -- Leave Paris and arrive in the Netherlands (The Hague)
May 12/13 -- Leave the Netherlands and arrive in Germany (Frankfurt, Black Forest)
May 16 -- Fly out of Frankfurt
Hopefully, the volcanic ash won't be an issue when we fly.