Only way is with an airline approved power bank that has an outlet. If you're in the US, you'll want to look for power banks that have a 3-prong outlet and don't exceed the FAA / TSA limit of 100Wh/27,000mAh. Individual airlines may have their own further restrictions.
I have the same issue with my 2020 Razer Blade 15. The 230w power supply exceeds the 75w airplane outlets. And Razer didn't introduce USB-C charging until their late 2020 models. I see that the latest Razer Blade 18 in 2024 accepts 25-100w USB-C chargers.
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EDIT: ^^^ I don't think a 100Wh/27,000mAh is enough to charge the laptop, it won't provide enough watts. Having not tried one myself yet, I'm not sure what the results will be plugging into it.
Only way is with an airline approved power bank that has an outlet. If you're in the US, you'll want to look for power banks that have a 3-prong outlet and don't exceed the FAA / TSA limit of 100Wh/27,000mAh. Individual airlines may have their own further restrictions.
I have the same issue with my 2020 Razer Blade 15. The 230w power supply exceeds the 75w airplane outlets. And Razer didn't introduce USB-C charging until their late 2020 models. I see that the latest Razer Blade 18 in 2024 accepts 25-100w USB-C chargers.