Start by saving all your receipts, from meals and accommodations to transportation and other incidentals. This will serve as concrete evidence of the financial impact the delay had on your plans. It's crucial to note that Air Transat, like many other airlines, may provide compensation for reasonable expenses incurred during a delay, but the specifics can vary. To understand the extent of your compensation eligibility, it's advisable to check Air Transat's official policies on their website.
Take a look at the site here to get the most accurate and up-to-date information on their compensation procedures. Airlines often have specific guidelines outlining what expenses they cover and to what extent, so familiarizing yourself with these details is key to a successful claim.