It's a course to be taken by an aircraft, as well as being a series of items occupying a sequence of locations in memory and identified within it by means of one subscript. Brian and Chris' sophomore effort is also a living entity which carries pathogenic agent and acts as a potential source of infection for members of another species. Brian and Chris probably had that first mathematical meaning in mind when they titled their album. I doubt they thought much about the aeronautical definition or the computer term. And I'm quite sure they didn't consider the biological definition.
Primary definitions serve their purpose just fine.
Leave the secondary ones to poets and the Supreme Court. Nonetheless, all four definitions apply neatly to the album, the work of Brian Fraser and Chris Palmatier. Thus, these songs follow a smooth, straight course to be taken by an aircraft. But, without vocals, the song is an afterthought. But, like any number of tracks from Brian Eno's Music for Airports , the sparse marriage of the tangible and ethereal is surprisingly memorable.