What happen to Continental Airlines?

Continental Airlines founded in 1934 was American airline based from Houston, Texas. Continental had 2 other airliners for flights with-in the United States called Continental Connection and Continental Express which they were use for domestic & connecting flights in it's code-share agreement.

In March 3rd 2012 Continental starting to merged with UAL Corporation meaning it's now with United Airlines along with other Continental companies merged along now with United Express. That also means when it Continental was merged United Airlines introduced more jobs, new destinations domestic & international and fleets like the recen't Boeing 787 Dreamliner.

United Airlines N17133 Boeing 757-200 new to Continental Airlines 1998 in Dublin, Republic of Ireland 7th February 2014

With the fleet & livery with United Airlines they are completely the same & some fleets are also from Continental like this one N17133 was new & delivered to Continental in 1998 this was one of the later Boeing 757-200 that has 2 emergency exit each side of the wing. 

United Airlines N661UA Boeing 767-300ER new to United Airlines in 1992 in Amsterdam, The Netherlands 21st July 2014.

But some aircraft were new to United Airlines before painting in 2010-present livery for example N661UA in Amsterdam, The Netherlands is a Boeing 767-300ER new to United Airlines in 1992: some United Airlines still have livery from 1998 but it sounds like most 767's are in current livery. If you live near major European airports I think you can still get some shots of United 90's livery in either Dublin, London Heathrow, Paris and Frankfurt.