Here are the mins:

• 1,500 hours fixed-wing total flight time
• 1,000 hours fixed-wing PIC time, or 500 hours PIC time and 500 hours SIC time in a turbojet
• 1,000 hours fixed-wing turbine time
• 1,000 hours fixed-wing multi-engine time (civilian or military) or 1,000 hours single-engine military fighter jet time
• A current ATP written exam
• A current first class FAA medical
• A current passport
• A Bachelor's degree is highly desired

Of course, mins are just mins. However CAL doesn't specifiy TPIC at all. I do not know if they were interns. I'd guess most of the people hired have internal recs...