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EasyJet

Delta, United, Jet Blue, probably American…

I’m annoyed on the relatively few trips where the carrier doesn’t allow this.

Most do. A number of european airlines require an extra fee to prebook a seat, but at least a year ago, many had maps available.

Most US Airlines also charge you extra to select a seat on the cheapest fare level. At least American and Delta along with Spirit and Frontier. If you choose to pay that fee during booking, you can normally select a seat then.

At least with the European ones I've travelled let you see the selection first, then nag for money. So answer to parent poster would be that's one option, but it's a hassle since you have to fill in a lot of forms before the payment stage where you can see the seat selection.

> Which airlines do this?

almost all non-low-cost airlines do this. BA, Iberia, Lufthansa, Air France, United, Delta, Avianca etc etc etc