The transport sector is a booming lucrative playground for cyber criminals that is increasingly fragmented, IBM researchers say.
Big Blue cites multiple menus for the budding transport hacker including raiding frequent flier and rewards schemes, citing breaches of British Airways and United Airlines.
But IBM advises says hackers can make a killing popping taxi and hire car companies and parking outfits, among others.
"Attackers seeking a treasure trove of sensitive information, credit card data included, need look no further than private transit companies such as taxi and limousine services," the researchers say.
"In the transportation industry, an interesting emergent trend is a focus on lucrative niche targets, for instance parking management companies.
"We have seen several incidents in this area during the past couple of years, a number of them involving offsite airport parking companies."