Aviation said MacBook Pro computers could dangerously overheat, leading the national carrier Air India to ban the model on its flights. Final models of the Retina MacBook Pro were unsupported with the release of macOS Ventura in 2022. Touch Bar (2016–2020) Apple unveiled Touch Bar 13- and 15-inch MacBook Pro models during a press event at their headquarters on October 27, 2016. All models, except for the baseline 13-inch model, featured the Touch Bar, a new multi-touch-enabled OLED strip built into the top of the keyboard in place of the function keys. The Touch Bar is abutted on its right by a sapphire-glass button that doubles as a Touch ID sensor and a power button. The models also introduced a "second-generation" butterfly-mechanism keyboard whose keys have more travel than the first iteration in the Retina MacBook. The 13-inch model has a trackpad that is 46% larger than its predecessor while the 15-inch model has a trackpad twice as large as the Retina models. All ports have been replaced with either two or four combination Thunderbolt 3 ports that support USB-C 3.1 Gen 2 and dual DisplayPort 1.2 signals, any of which can be used for charging. The MacBook Pro is incompatible with some older Thunderbolt 3-certified peripherals, including Intel's own reference design for Thunderbolt 3 devices. Furthermore, macOS on MacBook Pro blacklists (prevents from working) certain classes of Thunderbolt 3-compatible devices. Support for Thunderbolt 3 external graphics processing units (eGPU) was added in macOS High Sierra 10.13.4. Devices using HDMI, previous-generation Thunderbolt, and USB need an adapter to connect to the MacBook Pro. The models come with a 3.5 mm headphone jack; the TOSLINK functionality of previous MacBook Pro models has been removed. Other updates to the MacBook Pro include dual- and quad-core Intel Skylake Core i5 and i7 processors, improved graphics, and displays that offer a 25% wider color gamut, 67% more brightness, and 67% more contrast. All versions can output to a 5K display; the 15-inch models can drive two such displays. The 15-inch models include a discrete Radeon Pro 450, 455 or 460 graphics card in addition to the integrated Intel graphics. The base 13-inch model has function keys instead of the Touch Bar, and just two USB-C ports. The flash storage in the Touch Bar models is soldered to the logic board and is not upgradeable, while in the 13-inch model without Touch Bar, it is