Welcome! This is a simple python application that will allow you to search for a tail number from a past flight. So far, this application only supports domestic flights taken over 3 months ago (and as far back as 1987). You will need:
(a) The flight number
(b) The origin airport
(c) The date you took the flight
You can download and import helper.py into any instance of Python 3. I've included an IPython notebook with a demonstration on how to run the app. You only need an active internet connection for the app to work properly.
You'll need the requests[security] module, along with lxml, BeautifulSoup, and Pandas. There is an issue on Macs due to outdated OpenSSL. Update OpenSSL with homebrew before running this notebook.