This addon automates the creation of a one click travel form macro. It automatically adds the forms your character knows and will switch to the appropriate one depending on location and circumstance. This includes not being able to fly in Dalaran even though it's not marked as a non-flyable area.
Unzip the Zip archive in <World of Warcraft Classic Directory>/Interface/Addons
OBTF is licensed under the GPL v3. The full text of which is included with this addon.