Using a car sat on a plane purely for safety reasons is not rational and doesn't make sense. There are other reasons why it might be a good idea through,. Like squirmy kids, kids who sleep better in a car seat, kids who feel calmer and more relaxed, and also the fact that you know the car seat will never get lost or damaged with other luggage.
Looking at data, statistics, and real life situations show that a child on a plane is safer than anywhere else. It's almost unheard of that a child is injured on a plane and even more rare that a child survive an accident purely due to being in a car seat. To compare with something completely different to put into perspective. Each year 25 kids die from a falling television set in the home, over 500 kids drown each year and thousands are killed in vehicle accidents.
There are 25 000+ flight each day in US alone, the amount globally per day is just incredible. Despite of this, people killed by turbulence each year is close to zeo. In addition, most of the people who are injured during turbulence follishly did not use a seat belt even though fasten seat belt sign was on. Lap belts provide good protection but they must be used..... Quick data below is from a 15 year period and show just how safe flying is.
|From 1981 to November, 1996, there were 252 reports of turbulence affecting major air carriers. As a result, two passengers died, 63 suffered serious injuries, and 863 received minor injuries. Both of the fatalities in these incidents involved passengers who were not wearing their seat belts while the seat belt sign was illuminated. Of the 63 passengers who were seriously injured, 59 were not wearing their seat belts while the seat belt sign was illuminated.