Users have found that leaving on a Sunday can be a cost-effective option. It’s possible to save up to 10% on your flight compared to booking on days when demand is much higher.
When flying from Penang to Nanjing, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Penang Intl Airport to Nanjing Lukou Intl Airport flight would often be abbreviated as a PEN to NKG flight.