We have often used the air programs for CCL, RCCL and NCL with good results . The big savings seem to be with international flights . Do not rely on the site to pick well . Several times we were offered flights with layovers which were way too short and therefore bound for failure . Other times a different option for a small increase in price was much better . Remember, the cruise line acts like a TA and airline loyalty plans may determine which flight you book . Additional points and luggage allowances may be received .
Always listen to Hanks advice .