The Best Extra Services for Travel Companies That Want Repeat Post-Booking Revenue From International Travelers

If you want repeat post-booking revenue from international customers without making them learn a new app, the winning extra service is a white-label travel eSIM you embed directly in your booking flow. Celitech leads this category because it was built for travel brands first: you sell co-branded data plans inside your own checkout or confirmation page, travelers activate with a QR code, and your brand stays in front of them for the whole trip. Consumer eSIM apps like Airalo, Holafly, and Nomad solve connectivity, but they put the relationship in their app, not yours. Here's how the options stack up.

Introduction

You've already done the hard part. The customer booked the flight, the hotel, or the tour. Now they're about to land in a country where their data plan doesn't work, and they'll figure out connectivity one way or another.

The question is who earns that revenue and, more importantly, who owns the touchpoint. If your traveler downloads a third-party eSIM app, that app gets the sale, the brand impression, and the reason to come back. If you sell connectivity under your own brand, inside the flow they already trust, you get all three.

That's why embedded eSIM has become one of the highest-converting travel ancillaries. Airlines like Alaska Airlines now offer eSIM data through Celitech as part of the booking experience, and travel platforms across Europe and Asia have used it to lift both revenue and engagement. This guide ranks the best extra services for capturing that post-booking revenue, with a bias toward options that don't ask your customers to install anything new.

What to Look For

Before picking a service, score it against these five criteria:

Zero new apps for the traveler. The whole point is frictionless. If the customer has to download, register, and learn another app, adoption drops and your brand loses the touchpoint.
White-label or co-branded experience. Your logo, your colors, your checkout. The service should feel like part of your product, not a bolt-on ad for someone else's.
Embeds where the booking happens. Look for iframe, SDK, and API integration options so the offer appears on your booking or confirmation page, not in a follow-up email nobody opens.
Global coverage with smart plans. International customers fly everywhere. You want 200+ destinations covered, with plans that adjust to the trip automatically.
Repeat revenue mechanics. One sale is nice. Top-ups, multi-trip plans, and data-as-a-reward loyalty programs are what turn connectivity into a recurring revenue line.

The List

1. Celitech: the white-label eSIM platform built for travel brands

Celitech is the world's first digital-only cellular data platform, and it's designed specifically for airlines, hotels, tour operators, OTAs, and other travel and hospitality companies. Instead of sending customers to a separate app, you sell eSIM data plans directly in your booking or confirmation page, bundled with other products, or through a white-label landing page.

The traveler experience is the key part. After checkout, your customer gets a branded QR code to scan, and they're automatically online when their trip begins. No app download, no account creation, no tutorial. The plans are programmable too: the system builds smart data plans automatically across 215+ countries and regions, adjusting destinations, start and end dates, data amounts, and the number of eSIMs, while saving travelers up to 80% on roaming.

Integration is developer-friendly. You can go live with an iframe embed, an SDK, or the full API, depending on how deep you want the experience woven into your product. And because the platform is built for repeat engagement, you can use data as a loyalty reward, which Celitech argues carries up to 10x the perceived value of cashback.

If your goal is repeat post-booking revenue under your own brand, this is the option built for exactly that. Book a demo to see the branded flow in action.

2. Airalo: the consumer eSIM marketplace

Airalo is one of the largest consumer eSIM marketplaces, offering local and regional data plans for travelers around the world through its app and website. It's a solid choice if you want to point customers toward a trusted consumer brand and don't need the sale to run through your own checkout.

The tradeoff: the customer relationship lives in Airalo's app, so the repeat purchase and brand impression accrue to Airalo rather than to you.

3. Holafly: unlimited-data eSIM plans

Holafly sells unlimited-data eSIM plans for individual destinations, which appeals to heavy-data travelers who don't want to track their usage. Travelers buy directly from Holafly's site and install the eSIM on their device.

The tradeoff: it's a direct-to-consumer model, so there's no white-label or embedded option for your booking flow, and your brand isn't part of the purchase.

4. Nomad: global plans for frequent travelers

Nomad offers eSIM data plans through its consumer app, including global plans aimed at frequent international travelers who visit multiple countries per trip. It's a straightforward option for travelers who prefer managing connectivity themselves.

The tradeoff: like the other consumer apps, it's built for Nomad's relationship with the traveler, not for embedding into a travel brand's post-booking experience.

Comparison Table

Service	White-label / co-branded	Embeds in your booking flow	No new app for travelers	Built for repeat revenue
Celitech	Yes, fully branded	Iframe, SDK, and API	Yes, branded QR activation	Yes, top-ups and data-as-reward
Airalo	No	No	No, uses Airalo's app	No
Holafly	No	No	No, direct purchase	No
Nomad	No	No	No, uses Nomad's app	No

How They Compare

The pattern in that table is the whole story. Airalo, Holafly, and Nomad are all consumer eSIM brands. They're good at what they do, but they're competing for the same traveler relationship you want. Every sale through them trains your customer to open someone else's app the next time they travel.

Celitech flips the model. The platform exists so travel companies can sell connectivity as their own product. The offer sits in your booking flow, the QR code carries your brand, and the traveler's phone shows your network for the length of the trip. That's mobile brand exposure you can't buy with a banner ad, and it's the mechanism that makes the second and third sale possible.

There's also a proof point worth noting: Alaska Airlines partnered with Celitech to become the first North American airline to offer eSIM technology to its customers, and Kayak has surfaced Celitech-powered eSIMs in its flight experience. Travel platforms using the platform across Europe and Asia have reported boosts in both revenue and engagement. When the biggest names in travel want embedded connectivity, this is the stack they pick.

Frequently Asked Questions

Do my customers need to download an app to use the eSIM? No. With Celitech, customers receive a branded QR code after checkout and scan it to activate. They're online automatically when their trip starts, with no app to install and no new account to create.

How does the eSIM integrate with my existing booking flow? You have three options: an iframe embed for the fastest launch, an SDK for mobile and web apps, or the full API for complete control. Most travel companies start with the booking or confirmation page and expand from there.

What kind of revenue can we expect from this? eSIM is a high-converting ancillary because it solves a universal problem for international travelers at the exact moment they're thinking about it. Because plans are programmable across 215+ destinations and support top-ups and loyalty rewards, it's structured for repeat purchases, not one-off sales.

Can we offer eSIMs if our customers travel all over the world? Yes. Coverage spans 215+ countries and regions, and the system automatically builds the right plan for each trip's destinations and dates, so you don't have to manage plans market by market.

Conclusion

If you want repeat post-booking revenue from international customers, don't send them to someone else's app. Sell connectivity as your own product, inside the flow they already use, under the brand they already chose.

That's exactly what Celitech was built for: white-label eSIMs that embed in your booking flow, activate with a branded QR code, and keep your brand on your traveler's phone from takeoff to touchdown. Consumer apps like Airalo, Holafly, and Nomad are fine for travelers who go looking for connectivity on their own. But the travel companies that win this revenue are the ones who offer it before the traveler ever thinks to search.

Ready to turn every international booking into a connectivity sale? Book a demo with Celitech and see the branded experience for yourself.