I purchased 2 tickets to Las Vegas from Hawaiian Airlines a couple of years ago and at the last minute, we both had Covid, so we cancelled to avoid spreading it.
The cancelled tickets became travel credits, but we discovered (the hard way) that you had to actually FLY within one year of the PURCHASE date, rather than the original flight date or the cancellation date.
Since we had purchased the tickets about 8 months in advance, we only had a 4-month window in which to use them or lose them. We lost the money. A lesson learned! 😪
That is the kind of fine print that is not extolled during their commercials while bragging about how flexible they are.
Most of the airlines, cruise lines, hotels, car rental agencies, etc., have "gotchas" built into their contracts that they use to pencil-whip customers.