If you are facing an issue with United Airlines and feel that your concern hasn’t been addressed satisfactorily, escalating your complaint is a reasonable next step. To start, gather all relevant documentation related to your flight or service experience. This includes your booking reference number, receipts, boarding passes, and any prior communication with United’s customer service. Having these details ready will help ensure that your complaint is taken seriously and processed efficiently.

First, contact United Airlines' general customer service at +1-877-827-8493. Speak clearly and remain calm while explaining your issue. Ask to speak with a supervisor or escalation manager if the frontline agent cannot resolve your problem. It’s important to be firm but polite during this conversation. Clearly outline what went wrong, how it affected you, and what you expect as a resolution—whether it’s a refund, voucher, apology, or other compensation.

If the issue remains unresolved after speaking with a supervisor, consider submitting a formal written complaint. You can do this through United's official website by filling out their customer feedback form. Be concise and factual, and avoid emotional or aggressive language. Highlight all the steps you’ve taken so far, including dates, names of agents you spoke with, and reference numbers from previous conversations.

Should your complaint still not be addressed adequately, the next step is to escalate it further by contacting United's corporate offices. You can send a detailed letter or email to the airline’s executive customer relations team. In this communication, express your disappointment with how your concern has been handled so far and reiterate what you would like as a resolution.

Additionally, you can take your complaint to a higher authority if necessary. Contacting the U.S. Department of Transportation (DOT) or filing a complaint with a consumer advocacy group may help push United to respond more constructively. These organizations track airline complaints and can often influence airlines to resolve disputes more swiftly.

Throughout the entire escalation process, remain professional and persistent. Keep copies of all written communication and take notes during phone calls, including the names of the representatives you speak with. This record will strengthen your case and demonstrate that you have taken reasonable steps to resolve the issue directly.

By being thorough, respectful, and assertive, you increase the chances of a successful outcome when escalating a complaint with United Airlines.