A round-up of reader letters from Traveller (Sydney Morning Herald) packs a surprising amount of practical intel into one edition — from a scathing review of the 'world's best airline' to a costly lesson about leaving your wallet on a plane.

The headline complaint targets Qatar Airways, which has been named the world's best airline nine times, mostly on the strength of its business class. A passenger on a 10-plus-hour flight from New York to Doha tells a different story from the back of the plane: a toilet that went uncleaned for the entire flight, an overflowing bin, wet paper towels on the floor, and a crew response that consisted of locking the toilet without any sign — so passengers kept queuing for it. Add a seat-back screen still showing the reverse route and no announcement about a delay that nearly caused a missed connection, and it's a useful reminder that award wins are earned in premium cabins.

Qantas doesn't escape either. A business class traveller flying Melbourne–Tokyo Narita found the bento box 'run out' on both legs and was offered the economy menu instead — on the return flight, after other passengers had already claimed the good options. He also rates the Aspire Lounge at Narita as mediocre, and suggests skipping Qantas business if the food matters to you.

On a more practical note, one reader questions whether the $68 International Driving Permit is worth buying at all, having never been asked for one in 20 years of car hire. The editors push back firmly: many European countries require an IDP from foreign drivers, and if you arrive without one, the rental company can cancel your booking and charge a penalty. Cheap insurance, in other words.

There's also a cautionary tale from Dubai: a passenger left his phone and all his cards at an Emirates boarding gate and landed in Budapest with nothing. He was rescued by a laptop, WhatsApp and a generous friend — but the lesson is to stash a travel money card separately from your carry-on, just in case.

Rounding things out, readers weighed in on the eternal aisle-versus-window debate. Window loyalists cite Nile Delta views and an electrical storm over Afghanistan; aisle fans argue the freedom to stretch and use the toilet without guilt wins on any long-haul flight. One woman's compromise: marry a window person, take the aisle yourself.

Why it matters: none of these letters will change airline policy, but together they're a handy pre-flight checklist — manage your expectations in economy even on five-star carriers, don't count on your first meal choice in business, keep an IDP in your glovebox for Europe, and split your money across bags.