You may use Chase credit cards for churning, provided you abide by its 5/24 rule. According to this rule, you may apply for a new Chase credit card if you've been approved for four or fewer credit cards from any issuer in the past 24 months. Additionally, many Chase cards have rules restricting who is eligible to receive a bonus. Generally, you cannot earn a new bonus if you have one of those cards currently open or if you've received a bonus from that specific card or one from its family (e.g., Southwest cards) in the last 24 months.