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.

Billund Airport had its beginning in 1961 when the son of the founder of the Lego Group, Godtfred Kirk Christiansen, established a private 800-meter long runway and hangar north of his factory in Billund. With Christiansen as a key driver, more of the neighbouring municipalities were included in the group of owners, and it was planned that the airport should be expanded to a regular public airport.

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.  
Since the 1950s, the Lego Group has released thousands of sets with a variety of themes, including space, robots, pirates, trains, Vikings, castle, dinosaurs, undersea exploration, and wild west. Some of the classic themes that continue to the present day include Lego City (a line of sets depicting city life introduced in 1973) and Lego Technic (a line aimed at emulating complex machinery, introduced in 1977).[47]
The upper and lower wings are connected by a dark bluish grey 4 x 1 x 3 tail on either side; this tail element is unique to the set in this colour, although has previously appeared in a couple of sets back in 2003 in old dark grey. The upper wing is also supported by a couple of 1 x 2 x 2 black windows placed back to back in front of the cockpit, which from the perspective of the pilot really can’t be good for visibility. The biplane has a three blade propeller and the tips of the blades are stickered prior to sliding the propeller on to a 6L axle protruding from the front of the fuselage where it’s held in place by an orange 2 x 2 brick with domed top. The last step is to attach a 1 x 4 x 2 bar to the top of the upper wing for the Wing Walker to hold on to and then we’re done with the biplane.
I'm not sure what to make of the set yet. I like the planes (although that biplane really doesn't need the bubble canopy). The idea of adding a hangar is interesting and I don't mind that it's a bit open. But the fact that it'll only house one of the three planes is annoying. Having said that, I'm not sure what you could do about it. Tripling the hangar would make it big and boring and push the price up. Could they have done two planes and a double hangar?
If you don’t own Black Panther Pursuit or any of the sets that included Captain America, I guess it would a plus getting the both of them in this set but Super Heroes collectors tend to be completionists, so I think that scenario will be particularly rare. I guess you could always sell your spares on the secondary market, but really, who wants to do that?
It’s always tough to sum up a set that has the sort of price tag that this one carries; because it doesn’t necessarily offer the collectors value that a Marvel or Star Wars set will offer, it can be a little harder to justify an outlay on, in this case, a few planes and a aircraft hangar. However, if you have a love for the City range, whether it be a nostalgic look back at your childhood, the general consistently-superior design of the range, or simply because your kids want an airport to build, this one has to be recommended. Once I finished building this, I set it up in my daughter’s bedroom, and the overjoyed expression on her face, followed by the extended time taken to play with the planes and flying them all over her room, made every single minute of the build worthwhile. Watching her swirl around her room – and later, the rest of house – clutching the planes and bringing them in for landings into the hangar, reminded me of why I fell in love with LEGO in the the first place; imagination.