There are indeed many people who need good quality oxygen for their breathing purpose while on travel or even when at home. There is a new innovative product in the market now for all such people.
You can try out inogen oxygen concentrators which weighs less than 8 lbs and it is portable.
These concentrators can work on batteries for long hours and hence you can use them while on air travel or long distance car / SUV travel, or even when you are going on an outing.