Unit Imaginary Number. The unit Imaginary Number (the equivalent of 1 for Real Numbers) is â(â1) (the square root of minus one). In mathematics we use i (for imaginary) but in electronics they use j (because i already means current, and the next letter after i is j). Examples of Imaginary Numbers i
8 Things You Must Do When Your Flight Is Cancelled Or Delayed. 1  Fly in the morning. 2  Avoid regional jets flying out of hub airports. 3  Before booking, check a routeâs on-time performance.  Donât check bags.
What to Do if your US Flight is Delayed For flights within the United States, hereâs what to do when your plane doesnât leave on time: Hold onto your boarding pass and any other travel documents.