Question on #222

[https://github.com/DinisCruz/Book_Software_Quality/pull/222]

Am I correct to understand the following phrase: 
"And sometimes an easy way to do that is if there is any non-TLS traffic **flightier** up that could be used to inject . . ."
as
"Sometimes an easy way to do that is if there is any non-TLS traffic **higher** up that could be used"

Thanks.
