Basically, the only thing that the two sets have in common is that they both have planes. However there is quite a bit of difference on the inside of the planes. There are a lot more details in the Friends plane. In addition to the seats, there is a rolling service cart complete with refreshments, emergency lighting as well as a larger galley and lav in the back of the plane.
After World City's discontinuation in 2004, it was replaced with City as System's primary town-life related theme in 2005. However, unlike its predecessor, it was not limited to sets involving rescue services like Police, Fire or Coast Guard, but also introduced the first new construction site related sets since the discontinuation of City Center in 2000. In 2006, the first new airport set that included the first jetway since 6597 Century Skyway (1994) was released, as well as the first new hospital since 6380 Emergency Treatment Center from 1987. These releases expanded City to a scope only comparable to the original Town theme, and in 2009 it even went slightly beyond that, by introducing the first farm-related System sets. Also, in that year, City followed this route to release more truly civilian town life sets such as 7641 City Corner and 7639 Camper. In 2010 City released more civilian sets including 8403 Family House and 8404 Public Transport. In 2011 City re-introduced the Space sub-theme along with some new Harbour sets. In the first wave of 2012, City had forest police and fire sets as well as some more commercial/civilian sets. The second wave of 2012 featured the introduction of the Mining theme and respective sets, as well as a hospital. In the winter of 2013, Police and Fire sets were once again focused on but, contrary to those released in the previous year, were set in the city. In the summer of 2013, the Coast Guard and Cargo subthemes were brought back.
Lego pieces of all varieties constitute a universal system. Despite variation in the design and the purposes of individual pieces over the years, each piece remains compatible in some way with existing pieces. Lego bricks from 1958 still interlock with those made in the current time, and Lego sets for young children are compatible with those made for teenagers. Six bricks of 2 × 4 studs can be combined in 915,103,765 ways.
The airport handles an average of more than two million passengers a year, and millions of pounds of cargo. The airport's main runway can handle airliners as large as the Boeing 747, although most passengers arrive on smaller aeroplanes, such as ATR-42s, Boeing 737s and Boeing 757s. Boeing 747 activity at this airport is almost exclusively limited to cargo flights.
The final two minifigures are the Biplane Pilot and the intrepid Wing Walker. Both of these minifigures share the same white torso which is printed with a flight suit design overlaid with dark red and bright light orange flames plus a logo over the left breast. The torso design is superb and it can at present only be found in this set. Both minifigures are provided with a reddish brown aviator cap and dark bluish grey goggles, and the pilot (below left) also gets an alternative to this headgear in the form of medium dark flesh mid-length hair which has only ever appeared in five sets in this colour.