Songshan airport is located inside Taipei city. The observation platform is open from 9:00 to 21:00. It's a good place to see airplanes taking off and landing and also a good place having a virtual cache here.
The platform is located at the 3rd floor between terminal building 1 and terminal building 2. It is no entrance fees.
You can read the following links for more TSA information.
Official website for Taipei Songshan Airport (TSA): https://www.tsa.gov.tw
Wiki for TSA: https://en.wikipedia.org/wiki/Songshan_Airport
Blog article about this observation deck: 松山機場觀景台
How to prove your found?
It is easy to prove your found. Please visit the platform. And then take a photo and share it on your log. The photo should include your GPS device (or you) and the aircraft which is registered in Taiwan. (ex: Starlux, China airlines, Eva Air, Far Eastern Air Transport, Mandarin Airlines, Uni Air, and so on)
==== 2023/10/17 Update ====
Because of the construction, this observation platform is temporarily closed from 2023/10/16.
Therefore, please prove your visit as following before the construction completes.
Please take a photo in Songshan airport and share the photo on your log. The photo should include your GPS device (or you) at the airport. The photo has the aircraft registered in Taiwan is prefered (not necessary).
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Virtual Rewards 2.0 - 2019/2020
This Virtual Cache is part of a limited release of Virtuals created between June 4, 2019 and June 4, 2020. Only 4,000 cache owners were given the opportunity to hide a Virtual Cache. Learn more about Virtual Rewards 2.0 on the Geocaching Blog.