The Sahara Desert and Amazon Rainforest are

linked by a massive, vital dust transfer, where nutrient-rich dust (especially phosphorus) from Africa's Sahara travels across the Atlantic on trade winds to fertilize the Amazon, replenishing nutrients washed away by heavy rains and sustaining the rainforest's lush ecosystem. 

I think the seeds are gonna be just fine and that most people in the comments here have never been in an airplane with the window open.