Regent Seven Seas Cruises is offering air upgrades to business class on trans-Atlantic flights from $499 each way when select cruise departures are booked. In addition, the line is waiving its air add-on fares from more than 100 cities throughout North America. The luxury line, which marks its 20th anniversary this year, is touting the promotion as a celebration of the milestone.

The air upgrade promotion is valid for suite categories D-H; guests in Penthouse and higher suites receive free upgrades to business class. The offer has no current expiration date and is capacity controlled, based on seat and airline class of service availability and may be withdrawn or increased at anytime. Once booked, the rate will be locked in. The offer is available for new bookings only.

Travelers can choose from seven-, 10-, 12- and 14-night itineraries aboard the 700-guest Seven Seas Voyager and Seven Seas Mariner. Nine departures are included in the promotion, including the Mariner’s seven-night cruise from Istanbul to Athens departing July 13 and the Voyager’s 10-night cruise from Copenhagen to Stockholm departing July 12 and July 29.