Most airlines have those seats with extra legroom and still a part of the coach class which are called exit row seats. You may have to pay extra for this privilege on some airlines, while others offer them just by asking.
In addition to more legroom the passenger seated in the exit row also takes on the responsibility of determining whether an exit should be opened in an emergency or not, actually opening the exit and guiding people to it in the event of an emergency.
Airfarewatchdog breaks down the exit row policies by airline so you can pick the flight that makes it easiest or know what you have to do to get that extra stretch space for your feet.
Also check out: How to snag an exit row seat on your favorite airline