The following is the plane-set for the FIF 2017: Winter Campaign.
For a complete list of what aircraft modifications will be available during the campaign, please see the FIF 2017 "Winter Campaign" Plane modifications.
Since the FIF 2017: Winter Campaign is a completely fictitious event with no historical precedent, the aircraft selected are merely meant to suggest the pitch air battles of 1918.
There is definitely an attempt at a progression of technology, however. As we move through Phase A into Phase B, pilots should feel that in-game time is in fact passing.
Should there any questions, or possible oversights, please contact Klaiber.