Preheat air fryer to 400° Fahrenheit.
While air fryer preheats, place 2 medium steaks on large plate or cutting board. Season both sides of each steak generously, using 2 teaspoons salt plus more as needed.
Once air fryer is preheated, place steaks in air fryer basket, making sure steaks don't touch or overlap. Return basket to air fryer.
Air fry steaks 7 minutes, then remove air fryer basket and check steaks with internal meat thermometer. If needed, return basket to air fryer and continue cooking steaks, checking steak temperature every 2 minutes until desired temperature is reached. See Notes below for target temperatures.
Once target temperature is reached, remove basket from air fryer and transfer steaks to large plate or cutting board. Set steaks aside to rest 5 minutes.
After 5 minutes, plate steaks with desired sides and serve immediately.