I was wondering what I should write in the Textbox under the "Air Transportation Assistance" Section.
Thanks for helping,
As it says "If you have highly extenuating financial circumstances ..."
Only you know what circumstances apply to you. If you/your family need help with costs and can't afford air travel, just say so. House burned down, flood wiped out the farm, living in a shelter...might not be pleasant to discuss, but if they are behind your request, share them briefly.
The attached letter* can go into more detail if needed.
*...and upload a letter (PDF, PNG, or JPG) that confirms your need for additional financial assistance written by a teacher, supervisor, or other person of authority in your community. Make sure that it includes their role and contact information.