Flight flown + operated by completely different, non-code-share airline?

Yesterday (March 3) I flew Jetstar Pacific 596 from SGN to DAD. The airplane contained markings for vueling.com, the crew was wearing vueling uniforms, and despite being a domestic flight in Vietnam, flight announcements were made in English and Spanish. As far as I can tell, Vueling is a low cost carrier in Spain and this wasn't a code share flight.

It looks like this may have been the plane: https://m.planespotters.net/airframe/Airbus/A320/5940/EC-LZF-Jetstar-Pacific-Airlines

Can anyone explain what is going on? I've never seen anything like this before.

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What does it mean when a flight is operated by a different airline?

It's an arrangement whereby one airline provides an aircraft, crew, maintenance, and insurance to another airline, which pays by the hour. Wet leasing is often used by airlines with smaller fleets when they need aircraft to meet seasonal or sudden demand peaks.

What is codeshare flight example?

Code sharing works as follows, using United and Delta as examples: Say United Airlines offers a flight with its own flight number and sells tickets for it. However, the actual trip is operated by Delta Air Lines. The two airlines must have a commercial agreement to do this.

When a flight is operated by another airline where do you check in?

1. Re: Airline operated by another airline- where to check in? Check in with the airline actually operating the flight.

Why do airlines do codeshare?

Airlines have codeshare agreements because they want to be able to fly their customers to more destinations without having to buy more planes, hire more flight attendants, and pay more in airport fees. So, airlines partake in partnerships to facilitate this agreement.

Airlines - Codeshare Agreement

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Ricardo Esquivel, Kelly, Daniel Torobekov, Terrence Bowen