>> When you hear that it is too hot in Arizona and planes can't take off they are saying that the 737 can't take off. The CRJs and ERJs are usually first to hi

>> When you hear that it is too hot in Arizona and planes can't take off they are saying that the 737 can't take off. The CRJs and ERJs are usually first to hit operational temperature limits, not the 737. Edit: Also Boeing did have a 737 replacement project, but airlines did not sign on to that project and instead wanted another 737, so thats what Boeing gave them. https://en.wikipedia.org/wiki/Boeing_Yellowstone_Project https://en.wikipedia.org/wiki/Boeing_Yellowstone_Project