Offer applicable to Scenic Europe and South East Asia river cruises only, 2019 departures, for new bookings made April 1 – May 31, 2019. Commission increase to 20% based on cruise portion only. Not applicable for land extension, pre/post accommodation, port charges & taxes, and flight tickets. Combinable with current offer, past passenger and referral offers. Not combinable with group offers. Not applicable to National Geographic departures. Offer may be extended, sold out, canceled or withdrawn at any time without notice. Applicable for U.S travel agents/ agencies and bookings in USD only. Applicable only to legal residents of the 50 United States of America. Other restrictions may apply. Offer terms and conditions are subject to change without notice.