The rooftop viewing areas above Tokyo Haneda airport's domestic terminal 2 are vast and crowded with families at weekends. However there's plenty of space, and many aircraft movements to watch. The shops, cafes and restaurants are busy (strangely there is a particularly nice Italian as well as those offering Japanese fare) and there is no charge for access. Families arrive on the Metro (Subway) trains and seem to spend the day there. However the aircraft are essentially clones and for an enthusiast it starts to get a tad repetitive. But it is a great way to introduce young children to the wonders of flight.