Viking air when b2b with different cities on river cruises

[PRH]

We are taking the Viking River Portugal cruise and two days after debarkation taking the Budapest to Bucharest cruise.  Has anyone used Viking air to do this?  What was your experience?  Thanks 

[SM77]

We were supposed to do B2B for Elbe River & then Cities of Lights this past April.  Not a problem w/ booking the air through Viking.  The flights were from IAD to Berlin, Elbe ended in Prague, we had booked an extra night in Prague & then started Cities of Light, ending in Paris.  Flight home was from Paris to IAD.  So instead of paying for four flights, we only paid for two, got credit for the two flights we didn't use.  Our two river cruises were considered one booking.  Unfortunately due to COVID, it was canceled 😞.