coffee, upon request for 2019:
Spirit 79, Jetblue 73, Frontier 72, Southwest 80, American 77, Delta 85
so, your perception does not much the data. Possibly something wrong with the data.
Only half-joking: maybe we need to look at longer delays and comparable routes. Also, airlines may on purpose plan for longer trips to avoid being called on lateness.
Feel free to check out other stats. The data is by DoT BTS.
Good example how perceptions do not always match data even in a simple case. Forget about COVID…