Recently I finished reading Cruise Sign which at the same time means completing Flight Diary.
The last two routes I've read (and didn't write about here yet) were Kotori's and Amane's after stories, and they were great, especially Amane's (titled "Soaring Club's Prologue"). Very emotional, made me shed a tear here and there (and there were good laughs as well).
In addition to being continuation of Amane's route, it also - as the name would suggest - has flashbacks from the time when Amane, Isuka and Tatsuya were in the Soaring Club, and
After reading all routes (and comparing them with translated Steam version) I'd like to reiterate once more - ["If My Heart Had Wings" + "IMHHW:Flight Diary" + Akari's DLC] is the equivalent of translated "Cruise Sign" - there is exactly same content, both text and images. The only problem is bad translation of main game (Flight Diary is okay). But, contrary to popular belief, there is no additional censorship in translated version when compared to Japanese console version.
Overally, I'd give Flight Diary the same score I gave to the main game - 8/10. It was very enjoyable.
Translation of the Flight Diary available on the Steam is quite okay (if a bit stiff at places), but I spotted a few errors in each route. They aren't story-breaking, but they might be confusing at times, messing up some background details or not fitting into the context. I plan to fix those, and if everything goes well, make small text-fix patch.
Also, after completing all-ages version, I skipped through +18 version of FD. While when it comes to the main game I'm fine with either version, for Flight Diary I prefer all-ages. Especially in Kotori's and Amane's after stories, the placement of H-scenes is (IMO) quite awkward, and ruins the flow and the mood for me. I much prefer replacement scenes from Cruise Sign - they fit in better. I guess that Kanako's route is almost okay in +18 version, but the second scene uses one of the worst high-school moege H cliches:
Also, after thinking about it a bit more, replacement scenes from Cruise Sign still are cuter
So, all in all, Cruise Sign FTW - especially since we get Akari's route, which is much better than pretty generic threesome scene with Ageha and Hotaru from +18 version.
I'm not sure what to read next. Maybe something translated and light for a breather? Lamunation perhaps? Or go with a flow, stay in Konosora world, and read Snow Presents, which I recently got on DLSite's sale? Don't know yet. Actually, it turns out that reading untranslated, while slow, is kind of addicting for me - now sometimes I feel slightly weird when reading translated VNs... weird.