When checking in with Swiss Airlines, there are several options available to passengers to make the process smooth and convenient. How To Check In Swiss Airlines, here's a step-by-step guide within the constraint of 350 words:

1. Online Check-In: Swiss Airlines offers online check-in starting 23 hours before the scheduled departure time. Visit their official website or use the Swiss app to check in. Enter your booking reference or e-ticket number and follow the prompts to select seats and obtain your boarding pass. Make sure to check any baggage allowance and drop-off requirements.

2. Mobile Check-In: For added convenience, you can also opt for mobile check-in through the Swiss app on your smartphone. This allows you to check in, select seats, and have your boarding pass on your mobile device. Ensure your device is fully charged before heading to the airport.

3. Airport Check-In: If online or mobile check-in is not possible, Swiss Airlines provides traditional check-in counters at the airport. Locate the Swiss check-in area at the airport terminal and queue in the appropriate line. Have your travel documents, such as passport and booking reference, ready for verification.

4. Baggage Drop-Off: If you have bags to check, proceed to the baggage drop-off counter after checking in. Ensure your luggage meets Swiss Airlines' weight and size restrictions. Have your baggage tags securely attached and collect your baggage claim receipt.

5. Security Check: After checking in and dropping off your baggage (if applicable), proceed to the security checkpoint. Have your boarding pass and identification ready for inspection. Follow the instructions of security personnel for a smooth screening process.

6. Boarding: Once you have cleared security, monitor the flight information screens or announcements for your boarding gate. Arrive at the gate on time and present your boarding pass for scanning. Follow any additional instructions from boarding agents regarding boarding procedures.

7. Seat Selection: If you haven't pre-selected a seat during online check-in, inquire at the airport about available seat assignments. Depending on availability, you may be able to choose your preferred seat or request any necessary assistance.

8. Special Assistance: If you require special assistance, such as wheelchair services or dietary requirements, inform Swiss Airlines during the check-in process. They will accommodate your needs to ensure a comfortable journey.

Remember to arrive at the airport with sufficient time before your flight to complete the check-in process, clear security, and board the aircraft. Enjoy your flight with Swiss Airlines!