Here's what you got to know.
I've broken them as which ones are profitable and which ones aren't (Ill only include ones I used out of experience)
Profitable (Will usual make money)
IL-18
IL-86
IL-96
SSJ100 (Ran a entire airline with just this plane)
An-10
An-24
An-28 (Keep on routes under 300m and you should be find)
An-26 (Careful on longer routes, has 10 less seats than the An-24)
An-38
An-148/158
An-410
Tu-114
Tu-204
Tu-214
Tu-334
Yak 42
Let 410 (Keep on routes under 400m and you should be fine)
Can be operated with Profit (Most routes will not be profitable overall but it can be done none the less)
Tupolev Tu-134B (Keep out of routes between 600-900m (will not make any profit) and make sure you operate multi class, I fly a Tu-134B with 10 Business and 80 economy, flying them with 96 economy is pointless from what I learnt)
Tupolev Tu-154B/M (Wasn't able to experiment too much but they work well on routes under 600)
IL-14M (Can make profit if placed in the right routes)
Unprofitable
An-2 (All though it comes across as the perfect plane for short routes, I have found no way to make money on this thing)
IL-12 (Trash, won't make money on this one)
IL-14B (Same story as above)
IL-62 (Has a nice range but it really is a hungrier version of the VC-10, not even in regional routes does this thing make a dime)
Tu-134A (I haven't fully experimented with this one but too my knowledge it does not have enough seats, from what I read it should actual be able to fit 84 seats but the dev only put 76)
Tu-144 (Anyone who's flown this should know why this thing is trash in terms of money making)
Tu-154 (Too small and unreliable for anything)
Tu-154A (Haven't test this out much)
Yak 40 (I still buy this thing, I have yet to try in all business class or first class but have fun turning a 1$ on it.)
Be-30 (Won't do you any good)
They are other soviet/Russian aircraft in game but I haven't tried them yet.