Pros: Crew was nice and efficient. Flight departed and arrived on time. Flight comfort was normal for econo airline service.
Cons: Check-in at Frankfurt airport was horrible. Contract "Acciona" ground staff at Frankfurt airport was slow, inefficient, not knowledgeable, and overly officious. The airline does not offer on-line, advance check-in from Frankfurt, which is very 1990, not 2016. Even when passengers pay for advance seat assignments, as we did, it is impossible to change seats after booking the original ticket.