Comment by rockostrich

Disclaimer: I've worked for the OTA Hopper for 7+ years.

> Third party apps are not allowed by airlines to charge less than the airline

This is not necessarily true. OTAs are not allowed to list a price that undercuts the airline but there are definitely ways for them to undercut the price that the booker ends up paying e.g. offering credits that they can redeem on future flight bookings. In this scenario the airline still gets paid the full amount for the ticket and the OTA makes up the difference.

Airlines are fully within their right to withhold inventory from OTAs that do this, but that entirely depends on the relationship that the OTA has with the airline. In some cases airlines actually run discount campaigns through OTAs in order to capture a bit more market share or fill inventory that they're not seeing being booked through their first party website.

>I can assure you any "add-ons" offered by a third party are ultimately a scam

This is definitely not true. Any kind of insurance product offered by third parties are essentially just that. Hopper's "cancel for any reason" insurance is essentially paying a premium to make your ticket fully refundable. Typically airline inventory managers price refundable tickets at a fixed premium and there's an opportunity there for OTAs to essentially undercut that premium because it's a naive model.