I don't know much about Chile. The USA and UK it would be nearly impossible as the USA normally has 50+ airlines. I am currently running Copa Airlines in Panama City witch is nice because there is no competition. It all depends on when and where you start.
I could possibly help out. I can't be on 24-7 but can be on for a while in the late afternoon. What would you want me to do and where is the airline located?
Because it's easier for me to let people know in a group then it would be to let people know on this forum. And I figured most people have steam by now. It's also easier for people to request Airlines from me.
I have created a Steam group dedicated to giving away airlines. I have found out that I get bored after my airline becomes a certain size so after an airline becomes a certain size I will give it away. The link is http://steamcommunity.com/groups/AENP
My biggest suggestion is, be careful what country you start in. I am currently playing as Air Europa in Spain and and there are 6 other airlines based in the country so I have a bit of competition. I'm finding out it's hard to grow. The world I'm playing in has 60+ airline in the USA alone so I wouldn't start an airline there unless it was at the start. After year 1 don't bother. Be careful if you start anywhere in Europe as there is often A LOT of competition. Try starting in Central America, like in Panama City because most airlines in the USA overlook Central America. Mexico normally has a few airlines, though the world I'm in now only has 1 airline in Mexico so you could get lucky. Last tip, don't start on an small island like Iceland as it is very hard to be profitable.