Redeem them as a real discount
When paying for your booking, choose how many TRAVEL you want to redeem. They apply as a real discount on the total: cover part of the trip or pay for it entirely with them. The redemption value is calculated on the spot at the token's market price, and the remainder — if any — is paid with whichever method you prefer.
Once your booking is confirmed with the discount applied, redeemed tokens are not returned — not even if you later cancel the booking, and even when the cancellation itself is free.
Moving tokens out of an address resets its tier clock: if you redeem or transfer, the holding time accumulated on that address starts over.