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.
When preparing for your trip to Canada, call your airline or visit its website to determine its recommended and required airport arrival time. Check the airport's website to gain additional insight. Most airlines suggest arriving two to three hours early for a flight to Canada. If the airport is small, closer to two hours early is often sufficient. For many airlines, the minimum check-in time is 30 to 45 minutes before the flight leaves, but all airlines recommend you arrive well before this time.