[bmicraft]

They sure are letters, but they aren't generally thought of as being in the alphabet (which seems to be why they are just kinda tacked on after a space on wikipedia) and get ordered as if they where just the base letter (mostly)

[Symbiote]

Note that in Swedish they are considered letters, and in Danish and Norwegian Æ, Ø and Å are letters.

[paledot]

Letters which are sorted separately from what we'd think of as the base characters in English (they appear at the end of the alphabet, as W X Y Z Æ Ø Å, with C often omitted in Norwegian).

By contrast, my French dictionary has énorme nestled between enorgueillir and enquiérir. (Looking for an example does underscore some of the patterns in the language: page after page of ét~ with only a few et~ and one êt~ among them; pages of ex~ with no éx~ at all.)

[kalleboo]

Similarly in Swedish, W was not considered a letter but just a variant of V, so in phone books etc all the W names were mixed in with V names. This was changed in 2006 due to an increase in English loanwords.