Jonathan Rhys Meyers is in talks to star in Altitude, a thriller set on on a runaway hot-air balloon in the works from writer-director Marc Fienberg. The pic is in preproduction and shooting is scheduled to start in January in South Africa. 13 Films is repping international rights to the project and is presenting it to buyers at the American Film Market, which kicks off Wednesday in Santa Monica. Meyers would play a man who has planned the perfect romantic proposal to his girlfriend in front of their friends and family aboard a hot air balloon. An abrupt accident leaves only the couple and Bailey’s estranged ex-boyfriend on board as the balloon rises at out-of-control speeds, forcing the trio to try anything to stay alive. Branded Pictures Entertainment’s J. Todd Harris, 13 Films’ Greg Schenz, South African based Charl Van der Merwe of Silverline 360 and Kalahari Film & Media’s Irfaan Fredericks are producers. Tannaz Anisi is executive producing. Meyers is repped by ICM Partners.