Like the rest of South America, Venezuela is battling a harsh new pandemic wave fueled, authorities say, by more infectious virus variants from Brazil.
The money came from a 10-billion-euro rescue fund created by the government of Socialist Prime Minister Pedro Sanchez to help strategically important firms hit hardest by the pandemic.
Washington has handed control of the funds to Guaido who plans to use it to pay for access to the Covax mechanism and to invest in the cold chain necessary to vaccinate against Covid-19.
In a statement, the authority said flights were suspended until Venezuela permitted Copa to resume its service and re-established "fair and equal" treatment under a bilateral accord.
US tech firm Voatz, which has used the technology in polls in West Virginia, Colorado and Utah, is using blockchain technology to secure the online poll.
With a third of its 30 million people going hungry, embattled President Nicolas Maduro still hopes to retake congress from the opposition in Sunday's elections.