If you want a reliable, no-nonsense travel companion with a simple interface and a 2-pack value for sharing audio on long flights, choose Avantree Relay; if you need real-time visual feedback on your audio codec and battery status alongside a massive 30-hour runtime, choose Blue Air Airplane.
• Avantree Relay: Its biggest strength is the dual-unit pack that allows two separate connections or backups, paired with a straightforward design that prioritizes ease of use over complex displays. The trade-off is the lack of an onboard screen to visualize exactly which audio codec is active or the precise remaining battery percentage in real time. This pick is best for travelers who prefer a "plug and play" experience without fiddling with menus.
• Blue Air Airplane: It shines with its integrated OLED display that instantly shows volume levels, battery life, and the specific codec (aptX Adaptive, HD, or Low Latency) currently in use, offering total transparency into the connection. The trade-off is that it comes as a single unit, meaning you cannot share a second device simultaneously unless you pair two headphones to one adapter, and the interface requires more interaction to navigate. This pick is ideal for audiophiles and tech-savvy flyers who want to verify their audio quality settings at a glance.
The Avantree Relay is built for the practical traveler who views their flight entertainment system as a tool rather than a gadget. Its core design philosophy centers on reliability and simplicity. By utilizing Bluetooth 5.3 technology, it establishes a stable link between the airplane's 3.5mm AUX output and your personal wireless headphones. What sets this unit apart immediately is the inclusion of two adapters in the box. This isn't just a bonus; it fundamentally changes the utility of the product for couples or families. You can plug one into the seat jack and pair two different headphones, or keep the second unit as a spare in case the first one malfunctions mid-flight.
For those who prioritize long-haul endurance, the battery life is a significant selling point. The specifications confirm up to 20 hours of continuous playback, which comfortably covers even the longest transatlantic routes without needing a recharge. If the battery does deplete, the design allows you to plug the dongle directly into a power source and continue listening while it charges, eliminating the anxiety of a dead battery during a movie. The control scheme is equally pragmatic. Volume adjustments, pairing, and reconnection are handled via physical buttons, and the LED indicators provide basic status updates. There is no need to decipher a digital menu; the lights tell you when you are connected and when the power is low.
However, this simplicity comes with a limitation regarding information depth. While the LEDs indicate general status, they do not tell you what you are hearing in terms of codec quality. You won't see if the system has dropped from aptX Adaptive to standard SBC due to interference. Furthermore, because the package includes two units but only one is typically needed per passenger, the "value" proposition relies heavily on whether you actually need a backup unit or want to share audio with a friend without buying a second device. If you are someone who needs to know exactly what audio profile is running or prefers a sleek, single-device aesthetic, this might feel a bit too utilitarian. But for the user who just wants to plug in, turn it on, and fly without worrying about settings, the Avantree Relay is a robust choice.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-28 · 7 min read · Independent comparison
The Blue Air Airplane adapter targets a different demographic: the traveler who wants full visibility and control over their audio environment. Where the Avantree Relay hides its workings behind simple LEDs, the Blue Air Airplane exposes them through a dedicated OLED display. This screen is not merely decorative; it provides critical data in real time. As you adjust the volume, the number updates on the screen. More importantly, it identifies the active audio codec—whether you are streaming in SBC, aptX Low Latency, aptX HD, or aptX Adaptive. For anyone sensitive to lip-sync issues during movies or looking for high-fidelity sound, seeing that you are successfully connected to aptX Adaptive gives immediate peace of mind that the audio is being transmitted at the highest possible quality available for that connection.
Battery performance is where this unit truly distinguishes itself for long-distance flyers. With a stated average life of 30 hours, it outlasts many competitors by a significant margin. This capacity ensures that even the most arduous multi-leg journeys or red-eye flights across continents will not drain the power before landing. The charging speed is also notable, taking just 1.5 hours to fully charge via USB-C, which is convenient for quick top-ups during layovers. The enclosure is designed for portability, fitting easily into a pocket or carry-on, and features an auto power-off function to conserve energy when not in use.
The ability to share audio is a shared feature with the Avantree, but the implementation here feels slightly more focused on the "single hub" experience. You can connect two Bluetooth headphones to this single transmitter, allowing you and a travel companion to listen to the same in-flight entertainment simultaneously. However, unlike the Avantree's two-pack approach, you don't get a second physical unit. If you lose this one, you are without a solution until you find another. Additionally, the controls rely on push buttons that interact with the OLED display, requiring a bit more cognitive load than the purely tactile button setup of the Avantree. This product is perfect for the frequent flyer who values the assurance of knowing their audio is lag-free and high-quality, and who appreciates the extended battery life that eliminates the need to hunt for power outlets during a 14-hour flight.
• Best for Battery Life → Blue Air Airplane: With a 30-hour rating compared to the 20-hour limit of the competitor, this is the clear winner for ultra-long international routes.
• Best for Sharing Audio Without Buying Two Units → Avantree Relay: The 2-pack configuration means you literally have two devices, making it easier to manage multiple pairs or serve as a backup without purchasing a second adapter separately.
• Best for Visual Feedback on Audio Quality → Blue Air Airplane: The OLED display is the only feature that explicitly shows the codec name (aptX Adaptive vs. SBC), giving you concrete proof of your audio fidelity.
• Best for Simplicity and Durability → Avantree Relay: Fewer screens mean fewer points of failure; the LED indicators and physical buttons offer a rugged, distraction-free interface.
• Best for Charging Speed → Blue Air Airplane: A 1.5-hour charge time is faster than the implied charging duration of the other unit, getting you back in action quickly during short layovers.
• Best Value for Couples → Avantree Relay: Since you get two units, you can potentially equip two passengers independently or share one while keeping the other ready, whereas the Blue Air requires a single purchase for both users.
• Best for High-Fidelity Monitoring → Blue Air Airplane: If you need to ensure you aren't using the lowest quality codec, the real-time display is essential.
• Best for Minimalist Travelers → Avantree Relay: The lack of a complex screen keeps the form factor simpler and less prone to glare or readability issues in dim cabin lighting.
In my opinion, if I were packing for a marathon trip involving multiple long-haul legs, I would buy the Blue Air Airplane. The 30-hour battery life is a game-changer that removes the stress of finding a power outlet, and the OLED display provides a level of confidence that my audio is actually running at the best possible quality. Knowing I am using aptX Adaptive rather than guessing via LED lights makes the difference between a good flight and a great one. However, if I were traveling with a partner and wanted a guaranteed backup unit without spending extra money, the Avantree Relay would be my choice. Ultimately, for a serious headphone for running or gaming headphones for running, the clarity provided by the Blue Air Airplane's transparent codec monitoring offers the superior experience.
Yes, both the Avantree Relay and the Blue Air Airplane support standard Bluetooth headphones, including popular noise-canceling models like AirPods Pro, as long as they support the required codecs.
The Blue Air Airplane offers a longer battery life of up to 30 hours, whereas the Avantree Relay provides up to 20 hours, making the Blue Air better for transcontinental travel.
Both devices support aptX Low Latency and aptX Adaptive, which are designed to minimize audio delay and ensure lip-sync accuracy for video content on flights.
While prices fluctuate, the Avantree Relay often represents a higher initial value because it includes two units in the box, whereas the Blue Air Airplane is sold as a single premium unit with advanced display features.
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