Coming in a bit late, but Sancta, you’re a very valuable source of information!!! Thank you for your contributions.
As for what minivan is safest, well naming the Odyssey as the safest is accurate for 2010, that isn’t the case for each year. The Hyundai Entourage/Kia Sedona were for 2007 - I only know that year because that’s what I own. The Dodge could have been up there at some point too, I certainly haven’t checked each year. I’d hate for some parents to be second guessing their vehicle choice.
As for flying, we’ve flown with the kids many, many times and used car seats each time.
As for which car seat/booster seat you use, we use this
www0.epinions.com/review/Cosco_Apex_65_22531/content_218900172420 I rarely see it mentioned in car seat threads, and I’m not sure why. Maybe people don’t know about it? It goes up to 65 pounds as a 5 pt harness and a booster up to 100 pounds, it is also affordable. We’ve been in two accidents where these seats were used and we chose to replace them with the exact same seats.