Bubbles From Canada, joined Apr 2005, 1193 posts, RR: 52 Reply 3, posted (5 years 11 months 3 weeks 7 hours ago) and read 2423 times:
The main problem of this image is the plane looks slightly blurry. You tried to give more sharpening to compensate the blur, thus some jaggies appear in places, such as, titles, but not too serious. These tiny issues could sum up to a "quality" rejection.
By the way, this photo was rejected not only for quality, but also for other reasons.