It took millions of years for mars to lose most of it's atmosphere to the solar wind and it will take the same amount of time for any new atmosphere to be lost.
Yes. it's not like airlines would know better what aircraft they need.
"Real knowledge is to know the extent of one's ignorance."
Wow that's great bolo, real clever stuff. Now go away and jack it to your Hillary poster while the adults carry on with their conversation,..