I don't know of any, but airline flights have been bombed. I'm not sure that you can safely conclude that when there is a threat there will be no bomb.

10 Oct 1933 United Air Lines Flight 23 Boeing 247 destroyed by a bomb; first proven act of air sabotage.
9 Sep 1949 Canadian Pacific Air Lines Flight 108 Dynamite bomb sent as cargo; plane crashed.
13 Apr 1950 BEA Vigilant* Bomb detonated in bathroom over English Channel; plane returned safely.
24 Sep 1952 Mexicana de Aviación Flight 575 Bag exploded mid‑flight; 5 injured, plane landed safely.
1 Nov 1955 United Air Lines Flight 629 Bomb in suitcase exploded; plane crashed.
25 Jul 1957 Western Air Lines N8406H Dynamite charge exploded in lavatory; passenger killed, plane landed safely.
19 Dec 1957 SAGETA F-BAVH Bomb exploded in lavatory; plane landed safely.
16 Nov 1959 National Airlines Flight 967 Plane disappeared over Gulf of Mexico; suspected bomb, no wreckage found.
8 Sep 1959 Mexicana de Aviación Flight 621 Passenger detonated bomb at 11,000 ft; passenger killed, plane landed safely.
6 Jan 1960 National Airlines Flight 2511 Bomb-equipped plane exploded and crashed.
28 Apr 1960 LAV YV-C-AFE Bomb in cockpit; plane crashed.
10 May 1961 Air France Flight 406 Explosion caused crash over Algeria.
22 May 1962 Continental Airlines Flight 11 Bomb in passenger’s suitcase; plane exploded over Iowa.
8 Dec 1964 Aerolineas Abaroa CP-639 Dynamite planted by insured passenger; plane crashed.
8 Jul 1965 Canadian Pacific Air Lines Flight 21 Bomb caused crash; unsolved.
22 Nov 1966 Aden Airways crash at Wadi Rabtah Bomb placed to kill a leader; plane crashed.
29 May 1967 Aerocondor HK-757 Time bomb exploded at 6,000 ft; plane landed safely.
12 Oct 1967 Cyprus Airways Flight 284 Plane broke up; traces of plastic explosive found, likely bomb.
12 Nov 1967 American Airlines Boeing 727 Homemade explosive went off in baggage compartment; plane landed safely.
19 Nov 1968 Continental N17325 Explosion in lavatory; plane landed safely.
5 Aug 1969 PAL Hawker Siddeley HS-748 Passenger set off explosive in lavatory; plane landed safely.
21 Feb 1970 Swissair Flight 330 Bomb in cargo; plane crashed.
24 Apr 1970 Philippine Airlines Flight 215 Bomb in lavatory exploded; plane broke up.
10 Oct 1971 Aeroflot Flight 773 Bomb on floor near seat; plane crashed.
26 Jan 1972 JAT Flight 367 Bomb in forward cargo; plane exploded mid‑air except for one survivor.
25 May 1972 LAN Chile CC-CAG Pipe bomb in service compartment; plane landed safely.
15 Jun 1972 Cathay Pacific Flight 700Z Bomb in cosmetics case; plane exploded mid‑air.
16 Aug 1972 El Al 4X-ATT Explosive in portable record player; minor damage, plane returned.
19 Mar 1973 Air Vietnam XV-NUI Explosion in cargo hold; plane crashed.
24 Apr 1973 Aeroflot hijacking (Tu‑104) Bomb detonated on ground during hijacking attempt. 18 May 1973 Aeroflot Flight 109 Hijacker’s bomb detonated; plane crashed.
26 Aug 1974 TWA Boeing 707 Explosive in baggage compartment malfunctioned; fire after landing.
8 Sep 1974 TWA Flight 841 Bomb in cargo hold caused crash.
3 Jun 1975 Philippine Air Lines RP‑C1184 Bomb in lavatory; plane landed safely.
1 Jan 1976 Middle East Airlines Flight 438 Bomb in forward cargo; plane broke up.
6 Oct 1976 Cubana de Aviación Flight 455 Two bombs after takeoff; plane crashed.
17 Aug 1978 Philippine Air Lines RP‑C1184 Explosion in lavatory; damage repaired.
7 Sep 1978 Air Ceylon Avro 748 4R-ACJ Bomb exploded and started fire while parked.
19 Feb 1979 Ethiopian Airlines ET-AFW In‑flight explosion; plane crashed.
12 Dec 1981 Aeronica YN-BXW (Mexico City) Bomb detonated on ground before boarding.
11 Aug 1982 Pan Am Flight 830 Bomb under seat cushion; plane landed safely, 1 killed.
23 Sep 1983 Gulf Air Flight 771 Bomb in baggage; plane crashed.
18 Jan 1984 Air France Flight 171 Explosion in cargo hold; plane returned safely.
23 Jan 1985 Lloyd Aereo Boliviano CP-1276 Passenger detonated dynamite in lavatory; plane landed safely.
23 Jun 1985 Air India Flight 182 (and Narita bombing) Bomb in cargo hold; plane broke up, 329 dead (deadliest).
2 Apr 1986 TWA Flight 840 Explosion in passenger compartment; 4 dead, 7 injured, plane landed.
17 Apr 1986 El Al Flight 016 Semtex bomb and detonator found in luggage before departure.
3 May 1986 Air Lanka Flight 512 Bomb exploded on ground just before takeoff.
25 Dec 1986 Iraqi Airways Flight 163 Hijacking + grenades; plane crashed.
29 Nov 1987 Korean Air Flight 858 Bomb with liquid explosives; plane exploded.
21 Dec 1988 Pan Am Flight 103 (Lockerbie) Bomb in cassette player; plane destroyed, 270 dead.
19 Sep 1989 UTA Flight 772 Bomb in cargo hold; plane broke up.
27 Nov 1989 Avianca Flight 203 Bomb near fuel tank; plane exploded.
11 Dec 1994 Philippine Airlines Flight 434 Liquid explosive bomb; 1 dead, 10 injured, plane landed safely.
22 Dec 2001 American Airlines Flight 63 Shoe bomb attempt; failed, no explosion.
7 May 2002 China Northern Flight 6136 Passenger set fire; crash, all died.
24 Aug 2004 Volga-AviaExpress Flight 1353 & Siberia Airlines Flight 1047 RDX bombs on both flights; both crashed.
31 Oct 2015 Metrojet Flight 9268 Bomb in aircraft; broke up in Sinai, all died.
2 Feb 2016 Daallo Airlines Flight 159 Laptop bomb exploded; bomber ejected, plane landed safely.