My first post here so forgive me if its in the wrong spot but I wanted to link to some information I found on my frequent flyer board regarding higher weight harnessed seats and rear facing seats when flying.
For those of us who have their over 40lb children in 5 point harnesses, the good news is that we're now officially allowed to do so in the air. Before, technically, our seats could be taken away once our children were 40lbs.
With so many higher-harnessed seats now being used (and probably the standard in the future), this is welcome.
There has also been debate over rear-facing seats that blocked the person in front from reclining and caused problems on flights.
http://www.faa.gov/other_visit/aviat.../info09002.pdf
Handicapped children are also now allowed to use them for as long as they need a restraint when flying.