Check-in and bag drop close earlier than you think
The cutoff is not a suggestion and the person enforcing it usually cannot override it. Once bag drop closes, the baggage system has already been sequenced for that flight, and adding a bag late means holding an aircraft and a crew whose hours are legally limited. That is why the answer is no even when the plane is visibly still at the gate.
The same applies to gate closure. A gate that closes forty minutes before departure is not padding. It is the time needed to board, seat, count, load and complete paperwork within a slot that is not yours to move.
Security is a throughput problem, not a judgement of you
Staff at the scanners are managing a queue where every stopped tray costs everyone behind you a few seconds. The rules about liquids and electronics vary by airport and by scanner generation, which is genuinely confusing, and the honest advice is to follow the signs in front of you rather than what worked at a different airport last month.
The things that actually slow a lane down are predictable: belts and coats removed at the tray rather than in the queue, laptops buried at the bottom of a bag, full water bottles, and hand luggage packed so densely the image cannot be read. Packing so the machine can see through your bag is a real skill and it saves you the search.
Get your liquids bag and electronics out while you are queueing, not when you reach the tray. This one habit removes most of the friction from security for you and everyone behind you.
Nobody at the desk knows why your flight is delayed yet
Ground staff are told at roughly the same time as you, sometimes later. The information filters from the airline's operations centre, and the agent in front of you has no back channel. Asking repeatedly does not produce information that does not exist, and the person you are asking has been shouted at by eleven people already.
What they can do is rebook, and that is where being early in the queue matters enormously. If a cancellation is announced, join the queue and simultaneously phone the airline and check the app. Whichever gets to you first, take it. Passengers who do all three consistently get better outcomes than those who only queue.
Be honest about your bag weight and your mobility needs
Two things airport staff raise constantly. First, an overweight bag discovered at the desk is a slow, expensive and public repack that holds up everyone behind you. Weigh it at home.
Second, special assistance is a booked service with finite staff and equipment. Requesting it at least forty-eight hours ahead means someone is rostered for you. Turning up and asking means waiting for whoever becomes free, which at a busy terminal can be a long time. This is the single most common avoidable distress in an airport and the fix is a phone call before you travel.
The drop-off zone is not a car park
Kerbside drop-off at UK airports is now almost universally charged, tightly timed and enforced by camera. Staff and drivers see the same scene daily: a family saying an extended goodbye while a charge accrues and a queue builds. If you want an unhurried goodbye, do it at home and let the car do the airport bit.
On arrival, the equivalent friction is passengers messaging their driver from the runway. A driver who is tracking your flight already knows you have landed. Message once you have your bags, when you actually know how long immigration took.
Baggage reclaim timings are not within anyone's control
Bags come off in the order the handlers can get to them, across multiple aircraft, on shared belts. Priority tags help but are not a guarantee. The gap between the first bag and the last on a wide-body can be forty minutes, which is normal and is not evidence that yours is lost. Report a missing bag before you leave the baggage hall, because the claim is much harder once you have exited.
The people who have the easiest journeys
They arrive with the right amount of time rather than the minimum. They have their documents accessible rather than buried. They have weighed their bag, packed their liquids, and booked their assistance. They ask one clear question rather than five anxious ones. And they treat the person in front of them as someone applying a rule rather than someone who invented it, which, staff will tell you, changes how much discretion they are inclined to look for.