Trump's plans to impose tariffs on U.S. trading partners – including a reciprocal tariff regime that's expected to be formalized by early April and tariffs on the European Union he hasn't yet detailed – have spurred banks to relocate their gold reserves.
Commercial airline flights offer the most cost-effective way for banks to transport the gold from one location to the other – though the journey also necessarily includes the use of armored cars and security to ensure it arrives safely at its destination.
https://www.foxbusiness.com/economy/why-banks-flying-gold-bars-commercial-flights-from-london-nyc