I have consulted in Ukraine a number of times. I've never heard of that airline. Doesn't Ukrainian Airways fly the Kiev-Odessa route as well?

My Kiev-Odessa flights have gone relatively smooth, although the frayed seat belts and worn interiors can make it sketchy. However, I have tried the train route and found that difficult. When I used the train in winter the heat was so high that I felt I was in a sauna.

In the summer, it was also hot and muggy. It was great for meeting Ukrainians (and getting offerings of Vodka and Kelbasa), but I needed a full days rest afterwards. It is also a 12-14 trip.

I had more "coruption" problems on international flights than in-country. Look like you know what your doing. Be polite and firm. The people who looked vulnerable or too nice, usually got taken advantage of by corrupt cops or opportunist. That being said, a lot of Ukrainians are great people with hearts of gold.