The street address, city, state and ZIP code will suffice. Skip a line and date your letter. First, write out the month, then add the day and the year. For example, write the date as July 09 ...

There are all sorts of reasons that you might want to write a formal letter. They can be used to say thank you, to keep in touch with relatives, for booking holidays or applying for a job or work ...

Next to the chest you’ll find a cipher machine along with several lettered reels and documents – all clues to cracking the code and getting to the bottom of the Counting Letter mystery.

you're probably aware every airport in the world has a three-letter code. It's not surprising airports would have such an identifier, since it's easier to say and write than a full name.