https://docs.google.com/viewer?a=v&q=cache:o7bzNWqkTDcJ:ticc.tamu.edu/Documents/OhterInfo/Aviation/Aviation_Appendix.pdf+&hl=en&gl=us&pid=bl&srcid=ADGEESh2CaM66jeWBng0bSpPTgG-sMlybC4nMHIdXSLHQLMCnsgOHa8d_mp3yQjoMqUVRe49kR8JfO3makEHCs4tOaEIS6lf-9S-In_OoXCdZsmwuGWRqoU59pAHPE4C_wcOsok_Yl7v&sig=AHIEtbQTAlVHrKOfUrWvl6bGvV9BCVwS5w