Q: I often listen in to air traffic control on the internet. On the approach control frequencies, pilots will call in and identify themselves “with” a character from the phonetic alphabet. For example, “Approach this is United 515 at ten thousand with Alpha or “Approach United 827, five thousand feet with Uniform.” What does this mean?

Every airport puts out a broadcast that gives the current weather, approaches and runways in use, and assorted other info particular to the airport at that moment (some of it, to be honest, unnecessary). This broadcast, called ATIS (automatic terminal information service), is identified phonetically between A and Z.

On initial contact with approach control (or with ground or clearance control when departing), pilots are asked to report in with the most current letter, verifying they’ve listened to the broadcast and have an idea of what’s going on. Each time something is updated, the broadcast advances to the next letter. I will call in “with Sierra,” and the annoyed controller will snap back, “Information Tango is now up.”

I use the words “broadcast,” and “listened to,” because traditionally crews would tune to a radio frequency for ATIS, and transcribe its highlights onto a slip of paper. Nowadays, at most larger airports, it’s delivered through a cockpit datalink printout or is pulled up on our iPads.

For no useful reason, much of the typical ATIS report is abbreviated and coded using all kinds of nonstandard shorthand, and takes some deciphering. Aviation is frustratingly averse to the use of actual words, preferring instead a soup of acronyms and gibberish. I mean, it’s not the 1950s anymore and we aren’t using teletype machines to communicate.

Q: Tell us something weird?

What’s weird is that I haven’t been to a rock concert in thirteen years.

That’s super weird, really, considering how deeply into music I once was, and how many hundreds of concerts I attended. I can’t explain why, exactly, but I developed a later-in-life disdain for live performances. They suddenly felt goofy and weird to me: Am I watching or listening? Where do I stand? And none of the songs sound right.

You’ll tell me I’m just getting old Whatever the reason, I stopped going, even when the musicians are ones I love.

My last time at a show was in 2010, when I went to see Grant Hart in Cambridge. Prior to that we go all the way back to 2004, when I saw the Mountain Goats, also in Cambridge. Both times I was on the guest list, which made the idea of a night out more appealing. I’m not sure I would’ve gone otherwise. (Somewhere in there was Curtis Eller the banjo guy, and some symphonies, but those don’t count.)

That said, I’m told by a reader that the Bob Mould show in New Hampshire a couple of weeks ago was great, and at least half of the songs he played were classics from the Hüsker Dü canon. I wanna say that I wished I’d gone (the last time I watched Mould play live was in 1995). I was in Tanzania on vacation, so my excuse is solid, but even if I’d been home I may not have done it.

Concerts are one thing, but worst of the worst is any kind of live music in a bar or restaurant. There’s almost nothing I hate more. At least at a concert you’re there because, presumably, you enjoy the music of the artist you’re seeing. The music in a bar may or may not be anything you like. It’s intrusive, and conversation becomes difficult.

Here I’ll make this airline-related: On layovers in Accra, Ghana, I used to love hanging out at the poolside bar at the Novotel. It was such a chill place, with the most relaxing vibe. Then they brought in a piano player. Now the racket made talking almost impossible. He’d sing, too, and the beer mugs would crack when he hit the high notes. I had to find a new place.