Even in terms of play value it mostly seems to be a trade-off — 60104 loses the vending machine, cafe, baggage x-ray scanner, and a few seats on the plane but gains a baggage conveyor, a restroom, a refueling tank for the plane, an additional minifigure, and more seats in the waiting area. It's pretty nice to see the value of a LEGO air terminal remain fairly stable even though the price has not increased.
Correct me if I'm wrong, but is the hangar only large enough to house the biplane? A bit of a cock-up if that's the case. As good as the planes are, the hangar is a major failing. It looks like it's only about 30-40 pieces; just a bunch of big plates, some prefab cross-bracing and ... errrm ... air. Not so much a "hangar" as an aviation-equivalent of a car port!
There are several robotics competitions which use the Lego robotics sets. The earliest is Botball, a national U.S. middle- and high-school competition stemming from the MIT 6.270 Lego robotics tournament. Other Lego robotics competitions include Junior FIRST LEGO League (Jr.FLL) for students ages 6–9 and FIRST Lego League (FLL) for students ages 9–16 (age 9–14 in the United States, Canada, and Mexico). Jr.FLL and FLL offer real-world engineering challenges to participants. FLL uses Lego-based robots to complete tasks. Jr.FLL participants build models out of Lego elements. In its 2010 season, there were 16,070 FLL teams in over 55 countries. In its 2010 season, there were 2,147 Jr.FLL teams with 12,882 total student participants in the United States and Canada. The international RoboCup Junior football competition involves extensive use of Lego Mindstorms equipment which is often pushed to its extreme limits.[53] 

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The main wings are made up of a pair of white 10 x 10 wedge plates with cut corner and no studs in the centre; these are rare, having only previously appeared in two sets in this colour. The red 1 x 1 plate with tooth on each wing tip is also uncommon, having appeared in less than ten sets to date. The sides of the cockpit are made up of stickered red 1 x 4 x 1 panels, and it definitely helps if you concentrate when you apply the stickers, which I clearly didn’t as you can see in the picture below…. The area behind the cockpit canopy is nicely contoured by a red 4 x 4 triple wedge which, I was surprised to discover, has only previously appeared in a single set in this colour. Not to be outdone, however, the large 12 x 2 x 5 tail is appearing for the very first time in red. The hinged trans-black cockpit canopy is yet another rare element, appearing here for only the second time ever; rare it might be, but its pronounced curvature unfortunately means that it somewhat spoils the hitherto sleek lines of the jet. The flipside of this, however, is that the cockpit can comfortably accommodate the pilot.
Other than the planes, I do find it unfortunate that the Friends set focuses on shopping and food like so many Friends sets, and I also think it is unfortunate that the City terminal only has the basics of the airport structure in the control tower and service truck. Having a control tower for the Friends set would have been great. Having a gift shop/cafe for the City terminal would have been a worthwhile addition and not something we have seen in many City sets.
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.