For most booking sites (Airport and Hotel) use SEA.
The standard abbreviation for Seattle is SEA.
Seattle is found in Washington state and WA is the US Postal Service's approved abbreviation for Washington. Wash. is also an acceptable abbreviation.
SEA
The standard abbreviation is "assoc."
Decl. is the standard abbreviation for "declaration."
The standard abbreviation for height is ht.
The abbreviation for Seattle is SEA.
I don't think there's a standard abbreviation of "following" but we are used to using "ff." as the abbreviation of it.
No standard abbreviation
This abbreviation is Fr.
The standard abbreviation for California is CA.
The standard abbreviation for Skopje is SK.
Decl. is the standard abbreviation for "declaration."
The abbreviation for "Place" is Pl.