One thing is that starship leases are probably going to be a lot more difficult to get in the Traveller universe.
1) People do not just lease a Boeing 777 (or a Airbus A380 or whatever) and decide to fly off with it because they don't want to continue paying for it and mostly or totally get away with it (well it might, but I've never heard of it). This does happen in Traveller, apparently often enough that bounty hunters who specialize in "skip-tracing" exist.
2) Say what you will about the Straits of Malacca or the Somali coast, most ships do not run the risk of simply being seized by pirates on our present Earth. In Traveller ships do get stolen, repurposed, then sent back out or sold.
As piracy and skip-tracing don't really exist in the same way on present-day Earth (at least not without being caught reasonably easily), I think banks and owners of such jets are much more likely to lease stuff. However, such hazards are real in the Traveller universe. For that reason, leasing ships is probably going to be more difficult. If you want a lease in the Traveller universe, it's likely that you'd:
* Need to present the owners with a business plan. This business plan would be scrutinized with an electron microscope both to see if it's a sham to get a ship and if the business plan is realistic enough to actually turn sufficient profit to pay the lease (as being unable to pay the lease would tempt the borrowers to run off the with the ship) and that they'd get the ship back intact at the end of the lease (it seems that people letting you lease a mercenary cruiser would be pretty few and far between in the Traveller universe).
* Submit to reference-checking to determine the character of the borrowers and to determine if the borrowers are even who they say they are. This could take months, possibly even a year or two.
* You'd probably have to put up collateral in the form of money or goods that the people letting you borrow the ship would keep (or would be put in escrow). For a cheaper ship being leased to a trusted party who have a boring and safe (and profitable) business plan , this might be like 10%. For someone wanting to lease a Mercenary cruiser this collateral might easily be 50% or more of the value of the ship.
* Being Traveller, getting a reasonably high-ranked local noble in good standing to vouch for you, putting his or her good name on the line. This would probably excuse or reduce a lot the earlier conditions with the implicit understanding the noble's name would be tarnished and the noble would probably be responsible for paying out-of-pocket for the ship.