Originally Posted by rtalk25

Are there other airports in the NE or where winters are cold, without jet bridges but having mainline commercial service?

Does ILG have one?

LBE (used by Spirit) claims to have one:
http://www.palmerairport.com/html/terminal.html

"Finally, you’ll stay safe, warm and dry as you board through our new, state-of-the-art passenger loading bridge."