As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BETWEEN SLC & TWF PILOT REPORTED A LOUD BOOMING/STRIKING NOISE, AS IF HE HAD HIT A BIRD. UPON INVESTIGATION HE NOTICED THE ESCAPE HATCH WAS MISSING. HE NOTIFIED SALT LAKE CENTER OF THE SITUATION. NO OTHER DAMAGE WAS NOTICED. THE PILOT SLOWED THE AIRCRAFT AND CONTINUED SAFELY TO TWF.