Read and weep at the amazing story of Henrietta Lacks:
And here comes the floating tumor part:
Travel through air...unlikely, unless you really mean as an aerosol splashed or sprayed from one culture tube to another by someone not being careful. They do easily contaminate other cell cultures if people aren't careful with them, but regardless of the cells you're using, you need to use proper precautions to avoid cross-contamination.
As for giving them a new species name, that's controversial. A couple of people proposed it, but it hasn't been commonly accepted. We don't typically give new species names to cell lines that can only exist in a laboratory culture.
Separate names with a comma.