When time-and-a-half starts and when double time kicks in, transcribed from each agreement and cited to its page — the thresholds mechanics actually argue about, from the documents that decide the argument.
Overtime and double-time triggers for US airline mechanics, carrier by carrier, every rule cited to the page of the ratified union contract.
Minimums: 1-hour minimum OT increment (18.A); 8 hours minimum when working a scheduled day off (18.C); 4-hour minimum recall (18.K); 1 hour at base rate for after-hours technical support contact (18.L).
Minimums: 4-hour minimum when recalled/reporting on a scheduled day off; 1-hour minimum when called early for travel to another station (¶6); missed meal period pays an additional half hour (¶10).
Overtime cap: no rate above 2.0x under the Agreement (excluding premiums). Weekly: over 40 hours = 1.5x. Day-off work: first scheduled day off 1.5x; second/third consecutive day off 2.0x (8- and 10-hour schedules).
§ opens the citation: document, page, section, verification method and date. Not yet verified means nobody has confirmed it here yet — it is never assumed zero.