Looking to take a vacation via Space-A from US east coast to Europe. Major goals include Rome and Paris and maybe London. I am familiar with Space-A and understand the general principles, but if there are any nuances to traveling in the Schengen I would appreciate the insight. I also understand that Ramstein likely has the most number of flights. I have little idea about navigating the ground transportation with taxis, trains, or flying Ryan Air or something similar.

Thanks in advance