I am absolutely sure. You are right it is defiantly the sound of a commercial jet.
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It is not jumping to a conclusion it is applying specific knowledge. My house is located at the beginning of DFW Airport approach. I can sit outside an watch the same sight you see there flying right over my house.
We need to make a distinction about what is anomalous and what is not. Unless something like this is shown conclusively to be hovering or moving so erratically as to be impossible by known flight characteristics, then it is not intriguing. You need something like this happening before you start assigning the "unknown" moniker to it. Otherwise you need to assume it is an airplane, helicopter, blimp, chinese lantern, or whatever. If you don't then you wind up promoting the chicken little syndrome and before long nobody takes you seriously.
The object in this video is absolutely a commercial jetliner. There is absolutely no other explanation that can or will hold water. Anything else is just wishful thinking.
Now before you start calling me a debunker or whatnot, you need to understand that I accept that there are truly anomalous, structured, intelligently controlled craft that do not originate from any of the worlds governments. This isn't one of them.