SCHEDULE CHANGE. A planned change or a flight number/time change which can occur up to more than 72 hours prior to the flight's scheduled. departure. Examples - Change of flight times, change of flight numbers, reduction of service, discontinuation of all service. in a market. American uses an automated schedule change process up to 72 hours prior to departure. Through this automated. process all schedule changes are sent to the booking source for notification.
Describe the particles that make up the nucleus of an atom in terms of mass and charge. Protons, neutrons and electrons. Protons have a relative mass of 1 and a charge of +1, they are found in the nucleus of an atom.
Atomic mass is approximately the sum of the number of protons andneutrons found in the nucleus of an atom. Basically atomic mass isthe weight of the neutrons and protons in onâ¦e atom. For elements with no stable isotopes, the mass number of theisotope with the longest half-life is considered the atomic mass ofthe element. Atomic mass is, roughly, the number of protons in addition to the number of neutrons (M = P + N).