Unfortunately, as an professional Translator and designer , I'm not equipped to design visual templates or graphics. However, there are several online tools and resources that you can use to create your own custom flight itinerary template.
One option is to use a design tool like Canva, which offers a range of customizable templates for various purposes, including travel-related designs. You can upload your airline logo, change the airport details, flight numbers, and other details to create a unique itinerary.
Another option is to hire a freelance graphic designer on platforms like Fiverr or Upwork to create a custom itinerary template for you. You can provide your specific requirements and work with the designer to create a unique design that meets your needs.
Alternatively, if you have experience with graphic design software like Adobe Photoshop or Illustrator, you can create your own custom design from scratch using these tools.
I hope this helps, and best of luck creating your custom flight itinerary template!