I think that a great airplane to add would be the MD-80. It’s a legendary part of aviation and it deserves to be in the game
Here it is, you can vote here
Keep reading, posting, liking, and following the guidelines and you’ll get there in no time! Also, be sure to search for any similar existing posts before making your own, in order to avoid making a duplicate topic.
Below are some helpful links to get you started. This includes some information regarding trust levels and more importantly the how this forum works. We ask that you please take a look through this important material and understand these posts. A lot of hard work was put into these topics for new members like you. We hope you enjoy your experience here with us. Please don’t hesitate to message a moderator if you have any questions. And last but not least, have fun! Thanks for the help and understanding!
Also please see the MD-80 topic as mentioned by @AarkonTV and go vote for it!