Subways has always been considered a healthy choice by athletes since they offer such healthy ingredients in their sandwiches.

Who is "they" in this prior sentence?
Subways
Planet Express was bought out by Mom's Friendly Delivery Service so they can no longer be a threat.

Who is "they" in this prior sentence?
Planet Express
Burt installed Joey's software, and he was appreciative.

Who is "he" in this prior sentence?
Joey