By lunchtime on Thursday, Europe had already spent the morning answering anonymous tips with fighter jets, military airbases and bomb squads. The Guardian's running tally hit fifteen commercial flights. No explosives have been found. That is not reassurance. That is the point.

An Aer Lingus Airbus from Dublin to Rome was steered to Evreux, a French air force base west of Paris, after a bomb threat. France's air force scrambled escorts "as soon as the incident was reported". Sébastien Lecornu's office said it was watching "in real time". Three Ryanair flights bound for Sofia triggered the same alert; one from London Stansted put down in Plovdiv instead. A Wizz Air from Milan to Warsaw diverted to Vienna. Finnair confirmed two of its Helsinki departures — one to Rome, one to Vienna — faced "unfounded or hoax bomb threats". Four planes into Prague were swept after threats of improvised devices; Czech police rated the credibility "low" and found nothing. LOT's Warsaw–Brussels flight was inspected on the ground. Two more alerts hit Milan-bound Aegean and Ryanair flights. Bulgaria's transport ministry later confirmed: "no issues were identified."

Fifteen tips. Zero bombs. A continent's aviation system dancing to whoever can dial a threat.

This is not a one-off. It is a method

Tuesday was the dress rehearsal. About seven European flights — including two from the UK — were searched after suspected bomb threats. The British government called them "malicious hoax threats". No explosives then either. On Monday a Wizz Air from Luton to Sofia was escorted by a Hungarian fighter into Budapest. Thursday is the second wave in four days, and the bigger one.

Osprey Flight Solutions' Rhys Jones told Xinhua after Tuesday's cluster that seven confirmed bomb threats in a single day was "exceptional". His second observation matters more: "The lack of clear target state, airline or route indicates that general disruption to aviation operations is the aim." Thursday's map proves him right. Ireland, France, Italy, Austria, Belgium, Bulgaria, Czechia, Poland, Romania, Greece, Portugal, Finland, Spain, Denmark, the UK — low-cost carriers and flag carriers alike. Nobody is being singled out. Everybody is being jammed.

That is tip-line warfare. It costs the caller almost nothing. It costs airlines, airports, air forces and passengers a fortune in diversions, escorts, sweeps and missed connections. And it works every time Europe treats each tip as a fresh national emergency rather than a campaign.

Brussels is monitoring. Of course it is

After Tuesday's wave, a European Commission spokesperson said Brussels was "closely monitoring" and "in contact with the affected Member States". The EU Aviation Safety Agency was "also involved". Then the line that should be carved on the Berlaymont: "It is too early to draw conclusions on whether the reported incidents are linked. National investigations remain ongoing and fall under the responsibility of the competent authorities."

Too early. National. Competent authorities. The same vocabulary Europe uses when freezer controllers across seven countries flip to defrost overnight, when undersea cables are cut, when drones appear over air bases. DW noted the obvious overlap on Thursday: the flight threats arrived in the same week as cyber-attacks on supermarket freezers and reports around French blood banks — "the potential hallmarks of so-called hybrid attacks designed to cause maximum disruption with minimal effort".

Nobody has claimed Thursday's tips. This paper will not invent a culprit. Attribution is a job for police and intelligence services, not a newsroom with a deadline. What does not need a signature is the asymmetry. One tip can scramble a fighter. Fifteen tips scramble a morning. The attacker, if that is the right word, does not even need a bomb. Europe's own safety culture does the rest.

Safety first is not a strategy

Airlines are right to divert. Finnair's statement to the Guardian was honest: "Threats are almost always unfounded." "Aviation safety is our top priority and we take every potential threat very seriously." That is correct operational doctrine. It is also why the tip-line is such a cheap weapon. A serious aviation system must treat a mid-air bomb claim as real until proven otherwise. A serious continent must notice when that reflex is being farmed.

Czech police saying credibility is "low" while still running full pyrotechnic checks is the right double move for one airport. It is not a European doctrine. There is no public EU playbook for a multi-state tip-flood: no shared triage clock, no joint public communication that says "we see a pattern, here is what changes", no named official owning the campaign rather than the individual flight. National investigations "remain ongoing". Of course they do. That is how you lose a week of airspace to a phone.

EASA can certify aircraft. It cannot, by itself, answer a hybrid pressure campaign. Member states own policing. The Commission owns the habit of waiting for a signature before it will call a pattern a pattern. Tuesday's "too early" was already weak. After Thursday's fifteen, it is theatre.

Cheap attacks, expensive continent

Europe has spent the past year discovering that its soft underbelly is not only tanks and shells. Freezers in seven countries. Cable cuts in the Baltic. Drones over Leipzig. Now a tip-line that can park an Aer Lingus jet on a Normandy runway and send Ryanair passengers by bus from Plovdiv to Sofia. Each incident is "low credibility". The portfolio is not.

The right answer is not panic, and it is not pretending every tip is a state actor. It is refusing to let anonymity buy infinite disruption. Share the threat data across borders in hours, not days. Publish a joint assessment when the same method hits a dozen countries before lunch. Harden the channels that receive bomb tips so they are harder to spam. And stop pretending that "national investigations remain ongoing" is a policy.

Love your country. Question the leaders who keep discovering hybrid war one diversion at a time. Fifteen flights, zero bombs, and Brussels is still waiting for someone to sign the postcard. The postcard is the empty hold.