Hypokalemia, or decreased potassium, can arise due to kidney diseases; excessive losses due to heavy sweating, vomiting, diarrhea, eating disorders, certain medications, or other causes. Increased sodium (hypernatremia) in the blood occurs whenever there is excess sodium in relation to water.
General Arrival Time. In general, the airlines and the Transportation Security Administration recommend that passengers arrive at the airport at least 90 minutes before domestic flights, including those to Hawaii and Puerto Rico. This allows ample time for you to check in for your flight, check baggage and go through security screening. This recommendation refers to the time you actually arrive in the airport terminal, though. If you need to park, return a rental car or ride a shuttle from the airport parking area, include time for that.
As a general rule, arrive at the airport no later than two hours before your domestic flight is scheduled to depart. This is somewhat later than the typical suggestion of three hours for an international flight. Arriving two hours in advance gives you time to find the correct place to check in for your flight, wait in line there, wait in the security line, and deal with any complications that arise as you go through security.