jumbo aircraft

I’m a new user to this site so apologies if this questions been asked before, or asked in the wrong place, etc... I’m looking to increase my fleet after gaining a couple of slots vacated by my Santa jets and wondering what to go for, or should I just carry on with what I’ve got and save space...

I am just completing my first year I have generally been left completely cold by the "Events" that have appeared. I usually just ignore them, and was going to ignore Ash of Ash too. So what changed? Genuine daily bonuses for those playing the event. Completing flights to progress in the event...