[sgjohnson]

Maybe today, when the line between a Credit and a Debit card has gotten significantly blurrier (except in the US).

I definitely remember making an _offline_ payment with an AMEX card at a restaurant in the UK some 10 years ago.

Also, most airlines that take payments on board also run the terminals in offline mode.

There must be some mapping of BIN codes and whether to allow an offline transaction.

[glitchc]

It's up to the merchant to decide if they want to support offline payments and to what limit. The terminals certainly allow it. Your transaction will be stored in a secure way (either encrypted or in a secure element) until the terminal reconnects.

The way the rules are set up though, the risk of a failed offline transaction is almost entirely borne by the merchant. In most cases the merchant is unwilling to accept this risk and disables the feature.

[sgjohnson]

I guess for a restaurant it basically always makes sense to accept offline payments. I wasn’t aware that they might not be able to process card payments when I ordered.

I don’t typically carry any cash on me, and, well, if their terminals go down before I’ve closed my tab, they assume all of the risk anyway.

[tough]

I remember doing offline debit card payments 10y ago in a flight

they would pass the card with one of those old engraving things lol

[pjerem]

I think it’s still pretty frequent even nowadays. I have payment cards with systematic authorization and and others without and I can totally see the difference.

Transactions with the cards requiring authorization will take several seconds while with my other cards it will be instant most of the time.

It depends on the configuration of the terminal : most merchant will allow offline (or asynchronous) transactions up to a certain amount when there is an important flux of customers waiting to pay.

I’m also pretty sure (that’s speculation at that point but I felt it in my experience) that some cards have more chances to have instant (offline) transactions than others. The more « premium » the cards the less I saw the "waiting for authorization" screen. Especially for small amounts.

[Delk]

I remember paying at a bike repair shop that used a physical card imprinter [1], some, I don't know, 15 years ago?

[1] https://en.wikipedia.org/wiki/Credit_card_imprinter

[kalleboo]

About 15 years ago I remember paying for fast food delivery where the delivery guy put your card under the carbon paper bill and just rubbed a pen sideways back and forth over it a few times

[Nextgrid]

It also depends on the card. The card can decide and even stores a running counter of how much has been processed offline, after which it will want to go online to check and reset its counter.

[LeonM]

> Also, most airlines that take payments on board also run the terminals in offline mode.

Anecdotal, but most airliners I have recently flown with seem to have switched to online POS terminals, though they do still seem retain offline payment functionality as a fallback. I've seen payments being made, only for the flight attendant to return back to the passenger a few minutes later to inform that the payment was declined. This was over the ocean, so definitely no ground communication.

Airplanes for commercial flight all have VHF/HF or satellite connectivity, the've had that for a long time already. It's used for functionality like ACARS, voice connectivity, remote monitoring / diagnosis, etc. I can imagine this can also be used for payments and other low-bandwidth functionality.

Most airplanes also have WiFi access points on board, even when not offered to passengers. Typically these use hidden SSIDs. Speaking to an airplane tech once I know these are used for flight-crew handheld devices such as the POS terminals and iPads.

I happen to have a few friends that are pilots (all working for the same company) and they told me that their entire fleet already has Starlink terminals retrofitted, though they aren't offering that to passengers yet.

I guess what I'm trying to convey here is: the era of airplanes being 'offline' is already behind us.

[supertrope]

United Airlines requires credit cards to be linked to their app before takeoff. I assume this lets them run an authorization test charge to identify bad cards. https://www.united.com/en/us/fly/travel/inflight/save-a-form...

[account42]

Passenger WiFi is already not that rare, all that is missing now is for prices to come down to reasonable levels.