City is the thematic title under which most Town-related System sets were released from 2005 and onward. There are numerous sets that are associated with Construction, Police, Fire, Emergency, Train, Airport, Transportation, Cargo, Traffic, Coast Guard, Farm, Great Vehicles, Mining, and Space. European catalogs featured another theme called City in the years 1999 to 2000, which was referred to as City Center in American catalogs.
Lego also initiated a robotics line of toys called 'Mindstorms' in 1999, and has continued to expand and update this range ever since. The roots of the product originate from a programmable brick developed at the MIT Media Lab, and the name is taken from a paper by Seymour Papert, a computer scientist and educator who developed the educational theory of constructionism, and whose research was at times funded by the Lego Group.[51]

Play out real-life scenarios in LEGO DUPLO Town: a recognizable world with modern DUPLO figures. Help your little pilot get ready for take-off at the LEGO DUPLO Airport! It's easy for preschoolers to build the boarding gate, luggage slide and revolving air traffic control tower. Makes an ideal gift for preschool children. Contains 29 pieces. Airport measures over 8 (22cm) high, 5 (14cm) wide and 4 (11cm) deep. Plane measures over 3 (9cm) high, 7 (18cm) long and 6 (17cm) wide.
If you’ve watched Captain America: Civil War, you’d know that the airport is the scene of one of the coolest superhero showdowns ever, with Team Iron Man and Team Captain America duking it out on the tarmac. The scene is chaotic, gorgeously choreographed and most importantly stolen by the likes of Spider-Man (not included in this set) and Ant-Man transforming into the aptly named Giant-Man.
This is a good set if you want an airport. The set includes a big plain and a terminal. The terminal has a control tower, check-in, luggage handler, fuel tank, ... I expanded my terminal and built it on a 32x32 baseplate and used the 2 grey 16x16 plates for the roof. The backside is not completely closed. Otherwise is the luggage belt is not accessible with my hand. I added 2 extra seats in the plane. Normally you have 6 seats in the plane, but I raised it to 8. I wanted more than 8 but that is almost not possible. The plane is brought with a big brick which includes the middle of the plane and the 2 wings and that one limits the possibilities. The toilet in the plane is still on the backside.
Manufacturing of Lego bricks occurs at several locations around the world. Moulding is done in Billund, Denmark; Nyíregyháza, Hungary; Monterrey, Mexico and most recently in Jiaxing, China. Brick decorations and packaging are done at plants in Denmark, Hungary, Mexico and Kladno in the Czech Republic. The Lego Group estimates that in five decades it has produced 400 billion Lego blocks.[41] Annual production of Lego bricks averages approximately 36 billion, or about 1140 elements per second. According to an article in BusinessWeek in 2006, Lego could be considered the world's No. 1 tire manufacturer; the factory produces about 306 million small rubber tires a year.[42] The claim was reiterated in 2012.[43]
Bag 4 finishes the fuselage and all that is left are the engines and tail section.  You'll notice that this aircraft has a bathroom on board as well as some storage for a non-existent flight attendant.  I think this is the first time that LEGO has put some additional details into aircraft besides just seats.  Also there is only one pilot for a 2 seat cockpit in the set.  
This detailed model features a classic red, black and grey colour scheme, large driver's cab with detailed dashboard, wing mirrors, opening tool storage compartment, 4-cylinder engine with moving pistons, twin-axle steering, double rear axle and chunky tires. Activate the boom to position the water cannon and extinguish the flames! This Power Functions upgradable model can be rebuilt to create an awesome Fire Rescue Vehicle!
Every good airport needs a hangar for the planes, and this is no exception. The satisfactory hangar included here does come across as rather basic, and while it doesn’t detract from the overall package, it isn’t going to swing your decision over whether to purchase this (and truthfully, I think you would have already made that decision before you come to the hangar). The design itself is simple, with the build unlikely to take you more than 10 minutes. That being said, it is a well-built piece and doesn’t feel flimsy, which was the impression I had when I first saw a picture of it. The criss-cross pieces towards the base give it a firm foundation, and there are plenty of long pieces which add further stability to it. Plane-wise, it is best suited for the old-fashioned vehicle, with the orange colouring in the design going well with the plane. Only a couple of stickers in use here, with just the AIRSHOW HANGAR words needing to be added.
My Lego Network is a social networking site that involves items, blueprints, ranks, badges which are earned for completing certain tasks, trading and trophies called masterpieces which allow users to progress to go to the next rank. The website has a built in inbox which allows users to send pre written messages to one another. The Lego Network includes automated non-player characters within called "Networkers", who are able to do things which normal users cannot do, sending custom messages, and selling masterpieces and blueprints. The site also has modules which are set up on the user's page that give the user items, or that display picture compositions. Before My Lego Network, there were Lego Club Pages, which essentially held the same purpose, although the design lacked complex interaction.[65]
In 1997 they had an architectural competition for a new 430,000 ft² (40,000 m²) passenger terminal, designed to serve 3.5 million passengers a year, north of the original airport. KHR Architects won the assignment and completed the construction in co-operation with COWI, and at the end of May 2002 the new passenger terminal was put to use, as the first phase of the future expansion, which is scheduled to take place north of the start and runway, while air cargo services, business and private aviation will continue to be served from the existing buildings south of the runway. In connection with this expansion, the largest since the beginning of the airport, it was with effect from 1 January 1997 turned into a Joint-stock company, Billund Airport A/S, with the former members Vejle County and municipalities Vejle, Kolding, Grindsted, Billund, and Give as shareholders.
This set is designed for children aged 6+, and one of the ways that it is suitable for them is the inclusion of separate instruction booklets and numbered bags for the different parts of the set (see my post about LEGO age range suitability here).  A younger modeller can build the plane or other item of their choice as soon as they open the box. It's not so much one big set as 5 different parts which make a whole scene. My 7 year old son chose to build a jet first of all...
In December 2012, the BBC's More or Less radio program asked the Open University's engineering department to determine "how many Lego bricks, stacked one on top of the other, it would take for the weight to destroy the bottom brick?"[44] Using a hydraulic testing machine, the engineering department determined the average maximum force a 2×2 Lego brick can stand is 4,240 newtons; since an average 2×2 Lego brick has a mass of 1.152 grams (0.0406 oz), according to their calculations it would take a stack of 375,000 bricks to cause the bottom brick to collapse, which represents a stack 3,591 metres (11,781 ft) in height.[44]
Agent 13 has a pretty plain appearance, with caramel-coloured wavy hair, and a black, spy-like top. Her torso has some nice details, with sharp, angular lines that all combine to form a rough outline of an upside down star. She has plain sand blue pants and rocks a sub-machine gun accessory. I like regular LEGO firearms, so it’s very nice to get one in this set as they’re fairly uncommon.