It's a union shop, so most promotions are bids. Though there are a few jobs that are not bid and those are usually decided by plant manager and he doesn't go by seniority or performance, instead he will go by favoritism.
Help answer questions real people are asking about your company. Your answers will be 100% anonymous.
The person asking the question will be notified of your answer, and it will be posted publicly. Your identity will be kept private