Plaintiff John J. Magan appeals from the grant of summary judgment by the United States District Court for the Southern District of New York, Naomi Reice Buchwald, Judge, in favor of defendant Lufthansa German Airlines (“Lufthansa”). He argues that the court erred when it (1) decided as a matter of law that injuries sustained in the course of “light” or “moderate” turbulence as described by FAA turbulence reporting criteria can never qualify as resulting from an “accident” under the Warsaw Convention for purposes of imposing liability on an airline; and (2) determined that there was no genuine issue of material fact regarding the degree of turbulence experienced by Lufthansa Flight # 5318 on its March 27, 1999, flight to Sofía, Bulgaria, in the course of which Magan sustained injuries. Because we agree with Magan on both counts, we reverse the judgment and remand to the district court.
Background
Both sides in this case moved for summary judgment on the question whether the occurrence leading to Magan’s injuries amounted to an “accident” under the terms of the Warsaw Convention. 1 The materi *160 als submitted in support of their motions reveal the following facts. Magan was a ticketed passenger on Lufthansa Flight # 5318 from Munich, Germany, to Sofia, Bulgaria, on March 27, 1999. He was seated in row seven, seat F. The plane, a British Aerospace Avro 146 regional jet, has a center fuel tank that protrudes into the passenger cabin. It creates an overhang roughly nine inches deep that extends across the ceiling of the cabin from row five to row eight of the aircraft. Ma-gan had to pass under this overhang on the way to his seat as he boarded the aircraft. The bottom of the overhang stands at a height of six feet, three inches, while Magan stands at six feet, four inches.
About two hours into the flight, and about half an hour before landing, Magan went to the lavatory at the front of the aircraft. While in the lavatory, Magan heard the pilot announce that passengers were to return to their seats and fasten their seatbelts. The pilot noted in his deposition that he had observed heavy thunderstorms illuminated in red on his radar as the plane approached Sofia. Anticipating turbulence as a result, he issued the instruction.
Magan indicated that he finished up as quickly as he could and exited the lavatory. According to Magan, the aircraft was pitching violently at this point, making it difficult to stand. He was forced to use the backs of the seats to negotiate his way back to his row. Indeed, the pilot’s log indicated that the flight experienced what the pilot characterized as both light and medium turbulence. A fellow passenger also stated that the plane experienced “very significant” turbulence at this time.
Although Magan does not recall the precise details, before he could reach his seat and as he approached the overhang, something caused him to violently strike his head on it. The impact broke Magan’s nose and dislodged a dental bridge from his mouth. Magan’s vision became blurred and his nose began to bleed. Ma-gan recalls that he either temporarily blacked out or “greyed out,” but somehow managed to get back in his seat.
Soon thereafter, a flight attendant offered him ice and some aspirin. The pilot radioed the air traffic control tower from the air to send an ambulance and medics, which met the plane upon landing. Magan was eventually taken to a hospital in Bulgaria where he received treatment. Since the incident, Magan has suffered from severe headaches diagnosed by his doctor as “cluster headaches.”
Magan filed a claim against Lufthansa in the district court for his injuries under Article 17 of the Warsaw Convention. Lufthansa subsequently moved for summary judgment. The sole basis for its motion was the argument that the incidence of turbulence — which both parties assumed for purposes of summary judgment caused Magan to hit his head on the overhanging ceiling of the aircraft — -was not an “accident” for which the Convention contemplated liability. The district court agreed and entered judgment in Lufthansa’s favor.
See Magan v. Lufthansa German Airlines,
Discussion
We review the grant of summary judgment
de novo. Green Door Realty
*161
Corp. v. TIG Ins. Co.,
A passenger whose injuries fall within the scope of the Warsaw Convention is either entitled to recovery under the Convention or not at all.
El Al Israel Airlines, Ltd. v. Tseng,
The carrier shall be liable for damage sustained in the event of the death or wounding of a passenger or any other bodily injury suffered by a passenger, if the accident which caused the damage so sustained took place on board the aircraft or in the course of any of the operations of embarking or disembarking.
Warsaw Convention, art. 17 (emphasis added).
As we recently noted in
Wallace v. Korean Air,
this provision creates a presumption of carrier liability for passenger injuries sustained in the course of air travel.
Although
Saks
helped clarify the meaning of “accident,” courts have continued to struggle with its meaning in particular cases. Indeed, as the Court in
Saks
noted, “[i]n cases where there is contradictory evidence, it is for the trier of fact to decide whether an ‘accident’ as here defined caused the passenger’s injury.”
Id.
at 405,
Lufthansa relies on criteria developed by the Federal Aviation Administration and the National Weather Service for pilot communications regarding turbulence in making its argument that the events leading to Magan’s injuries did not constitute an “accident.”
4
It argues that, regardless whether turbulence caused Magan to strike the overhang in the passenger cabin,
5
“light” and “moderate” turbulence as described in the criteria — in which passengers may experience difficulty walking and strain against their seatbelts, and in which unsecured objects may become dislodged — are an expected part of every normal flight and therefore can never meet the definition of “accident” found in
Saks.
According to Lufthansa, however, “severe” and “extreme” turbulence — in which walking is impossible and unsecured objects are tossed about the cabin — do meet the definition because they are much rarer. The district court adopted this argument,
*163
crafting a new rule of law which, using the criteria to delineate the boundary for liability, bars recovery for any injuries that are the result of “light” and “moderate” turbulence.
Magan,
Magan, on the other hand, argues that the degree of turbulence is irrelevant to the inquiry outlined in Saks, and that as long as the turbulence results in an impact — an event external to the passenger — the definition of “accident” is always satisfied. According to Magan’s argument, as long as the injury is not the result of a purely internal passenger reaction, the airline should be liable.
These two approaches focus on individual, and different, component parts of the
Saks
definition of “accident” to the exclusion of the others. Moreover, they fail to acknowledge that the definition delineated in
Saks
will not always be susceptible to easy application.
See Saks,
The Supreme Court’s formulation of “accident” bears repeating: “an unexpected or unusual event or happening that is external to the passenger.”
Saks,
Nothing in these various formulations suggests that a bright-line rule of liability should be, or necessarily can be, established for particular weather events and all their attendant consequences. The
Saks
definition makes specific reference to the individual passenger’s injuries as part of its inquiry. Lufthansa’s, and by adoption the district court’s, rule merely looks to whether a particular weather event is “unusual,” without regard to that second portion of the definition.
Cf. Margrave v. British Airways,
Furthermore, although the degree of turbulence — as opposed to its mere occurrence — may be relevant, among other factors, to the question whether an “accident” has occurred as a matter of
fact,
the trial court’s attempt to graft weather-reporting criteria for pilots onto the definition to create a new rule of
law
is misplaced.
Cf. Wallace,
Additionally, though the district court found that “light” and “moderate” turbulence are “relatively common,” and that “severe” and “extreme” turbulence are “exceedingly rare,”
Magan,
Both parties seek to support their arguments with cases, including cases from foreign courts applying the Supreme Court’s definition of “accident” found in Saks, in which an instance of turbulence has or has not been found to constitute an “accident.” 8 But these cases do not stand for *165 the proposition that some types of turbulence are always accidents while other types are never accidents as a matter of law, nor that turbulence will always constitute an accident; rather, they illustrate that it is a fact-specific inquiry best left for resolution on an individual basis. 9 Cf. Koor v. Air Canada, No. 99-CV-164436, 2001 A.C.W.S.J. Lexis 15292, at *18 (Ont. Sup.Ct. of J. Jun. 12, 2001) (noting that with regard to whether turbulence constitutes an accident in any given case, “individual circumstances ... govern”). Indeed, with the exception of Lunn, the cited cases directly addressing the question whether particular turbulence constituted an “accident” (Weintraub, Koor, and Quinn) were decided following a trial on the merits — precisely the right place for the question to be resolved when the record is as conflicted as it is here.
With respect to this case, not only is it unclear from this record whether, as a matter of fact, a particular type of turbulence is a normal part of any given flight, cf. Quinn v. Canadian Airlines Int’l Ltd., No. 35558/91U, 1994 Ont. Sup. C.J. Lexis 1127, at *57 (Ont. Sup.Ct. of J. May 30, 1994) (noting that evidence at trial indicated that turbulence was common on particular flight from Toronto to Florida), but the record is far from settled regarding the amount of turbulence actually experienced by Flight # 5318. As noted above, while the pilot characterized the turbulence as both “light” and “medium” in his log, 10 Magan himself indicated that he found walking almost impossible — one hallmark of severe turbulence under the criteria. A fellow passenger characterized the turbulence as “significant” in a statement submitted to the court. Magan also submitted expert testimony that, based on the meteorological data regarding the weather outside of Sofia, the heavy thunderstorms observed by the pilot “provided the physical mechanisms ... to produce significant (moderate or greater) turbulence.” (Emphasis added.) The expert further opined that Magan’s injuries suggest that the aircraft not only encountered moderate turbulence, but also possibly “momentary severe turbulence.” This is consistent with the FAA’s own data regarding the interplay of thunderstorms and the occurrence *166 of turbulence. 11
By concluding that Flight # 5318 experienced only light and moderate turbulence, the court essentially credited the pilot’s characterization over those of Magan, a fellow passenger and Magan’s expert. This is not appropriate at the summary judgment stage, as such determinations should be reserved for trial.
See Curry v. City of Syracuse,
In sum, the trial court erroneously concluded as a matter of law that turbulence that is “light” or “moderate” according to FAA guidelines may never constitute an “accident” for purposes of liability under Article 17 of the Warsaw Convention. Furthermore, the trial court erroneously concluded that there was no genuine issue of fact regarding the degree of turbulence experienced by the flight in which plaintiff sustained his injuries. Accordingly, the district court’s grant of summary judgment was inappropriate.
Conclusion
In light of the foregoing, we reverse the district court’s grant of summary judgment and remand for further proceedings consistent with this opinion.
Notes
. The Warsaw Convention is, of course, a treaty governing international transportation by air.
See
Convention for the Unification of Certain Rules Relating to International Transportation by Air, concluded at Warsaw, Poland, Oct. 12, 1929, 49 Stat. 3000, 137 L.N.T.S. 11 (entered into force in the United States in 1934),
reprinted in
note following 49 U.S.C.A. § 40105 (2002) [hereinafter "Warsaw Convention”]. The United States has more recently ratified amendments to the Convention set forth in what is known as the
*160
Montreal Protocol No. 4. See
King v. Am. Airlines, Inc.,
. Under the original Convention this presumption of liability was subject to several defenses, including the defense of due care,
see
Warsaw Convention, art. 20(1), and the defense of comparative or contributory negligence,
see
Warsaw Convention, art. 21. Furthermore, the Convention set strict monetary limits on air carriers' liability under Article 17.
See
Warsaw Convention, art. 22(1). The majority of airlines subsequently waived the Article 20 defense of due care in a voluntary arrangement known as the Montreal Agreement of 1966.
See Wallace,
. Courts have theorized that one of the guiding principles that pervades, and arguably explains, the original Convention, the subsequent modifications, and even the Court’s decision in
Saks,
is an apportionment of risk to the party best able to control it, which provides some degree of certainty and predictability to passengers and air carriers, and which encourages them to take steps to minimize that risk to the degree that it is within their control.
See Wallace,
. The criteria can be found in Table 7-1-6 of the 2000 edition of the Aeronautical Information Manual, published by the FAA and cited by the District Court. Fed. Aviation Admin., Aeronautical Information Manual: Official Guide to Basic Flight Information and ATC Procedures, at 7-1-30 (2000),
quoted in Magan,
.Lufthansa does not concede this point, as Magan contends, but rather simply assumes it in its legal argument that light and moderate turbulence can never be considered an "accident,” regardless of its consequences.
. The trial court did postulate that its rule would promote the Convention’s general goal of uniformity regarding the law governing international air transportation.
Magan,
. The district court’s rule in this case could arguably frustrate the criteria’s goal of accurate weather reporting by pilots, for pilots might be encouraged to underreport the severity of turbulence if their employer's liability hangs in the balance.
.See, e.g., Weintraub v. Capitol Int'l Airways, Inc.,
16 Avi. Cases (CCH) ¶ 17,911 (N.Y.Civ.Ct. Jun. 30, 1980) (finding that incident in which plane swerved left, then right, and made a sharp dip constituted an "accident” under Article 17),
aff'd
16 Avi. Cases (CCH) ¶ 18,058 (N.Y.App. Term Feb. 2, 1981);
Lunn v. British Airways,
N.Y.L.J., Jul. 14, 2000, at 28 col. 3 (N.Y.Civ.Ct. Jul. 14, 2000) (concluding turbulence that plaintiff likened to driving over a speed bump did not constitute "accident”);
Koor v. Air Canada,
No. 99-CV-164436, 2001 A.C.W.S.J. Lexis 15292, at *20 (Ont. Sup.Ct. of J. Jun. 12, 2001) (finding as a matter of fact that turbulence that threw passenger to the floor of aircraft was not an "accident”);
Quinn v. Canadian Airlines Int’l
*165
Ltd.,
No. 35558/91U, 1994 Ont. Sup. CJ. Lexis 1127, at *57-58 (Ont. Sup.Ct. of J. May 30, 1994) (finding as a matter of fact that turbulence which, although of some quantity, was less than severe, and which was a minor contributing cause to injuries whose main cause was osteoporosis, did not constitute "accident”);
see also Bradfield v. Trans World Airlines, Inc.,
. We do not express any opinion regarding the merits of these individual decisions.
. Interestingly, the record shows that Lufthansa has its own set of turbulence reporting criteria in its operations manual which differ slightly from those of the FAA. Notably, Lufthansa relies on g-force measurements (measuring changes in air speed, or acceleration) experienced by a flight in the course of turbulence to differentiate between the particular types of turbulence.
. The Advisory Circular that sets forth the turbulence criteria used by the district court indicates in a section captioned “Locations of Probable Turbulence” that, while moderate turbulence "can be encountered” in and near thunderstorms "in the dissipating stage,” severe turbulence tends to occur "in and near growing and mature thunderstorms.” AC 00-45E, at 14-1 through 14-2 (emphasis added). Additionally, the Advisory Circular states that extreme turbulence will occur in severe thunderstorms. Id. at 14-2. There is no evidence in the record regarding the stage of the thunderstorms encountered by Flight #5318, but this again highlights the fact-specific, as opposed to legal, nature of this inquiry and also the conflicted, imperfect state of the evidence.
