LBA-SXF is down as a 733 all year. The 733 has a lower cruise altitude than a 738 and due to the short distance 29,000 is the optimum altitude for that aircraft on that route so thats why you will see FL290 more often than not.
Nah, I’m not having that. I don’t know the reason that it was at FL290, but that most definitely would not be the most optimum level to cruise at in a B733 for a flight of that distance. We regularly used to operate theANS to LBA at FL360.