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.
of many smaller subatomic particles. Atoms have three main important subatomic particles that are proton, neutron & electron. Proton & neutron have a much greater mass than the electron as one proton equals to 1/1840 electrons. Neutrons & protons are tightly bound together to form the nucleus of the atom hence nucleus contains all the mass.