With these very successful sale fares in Jan and Feb and with load factors still low, I wonder if doing a limited fare with extremely low fares would be cheaper than buying ads. I've seen this in Europe, MyAir with a 1 Eurocent (and bookable) fare on many flights and RyanAir often with 9 Euro O/W fares. If you leave it on for a while and keep some unpopular flights available this should generate some free buzz.