Clue: Letters of transit?

Answer: UPS

Length: 3

---

Similar Clues:

• Office workers' letters (TGIF with 4 letters)
• Office building problem that's a hint to this puzzle's theme entries (see their last three letters) (RECYCLEDAIR with 11 letters)
• Parisian rapid transit letters (RER with 3 letters)
• NYC transit letters (IRT with 3 letters)
• Transit offerings (RIDES with 5 letters)
• Post office letters (COD with 3 letters)
• Box office letters (SRO with 3 letters)
• Letters after some officers' names (RET with 3 letters)
• Letters that are not at the post office (EMAIL with 5 letters)
• Box-office letters (SRO with 3 letters)